List of Publications

• Precompact minimal topologies on rings, Annuaire Univ. Sofia Fac. Math. Méc. 67, (1972/73) 391-397.
• Precompact minimal topologies on Noetherian domains, C. R. Acad. Bulgare Sci. 29, (1976) 1561-1562.
• Minimal ring topologies and Krull dimension, Topology, Vol. II (Proc. Fourth Colloq., Budapest, 1978), pp. 357--366, Colloq. Math. Soc. János Bolyai, 23, North-Holland, Amsterdam-New York, 1980.
• On a class of topological rings, Proc. 7-th Conf. of the Union of Bulg. Math., Sunny Beach, (1978) 305-313 (in Bulgarian).
• Minimal extensions of finite fields, Proc. 8-th Conf. of the Union of Bulg. Math., Sunny Beach, (1979) 208-215 (in Bulgarian).
• Minimal topologies on rings, Proc. 8-th Conf. of the Union of Bulg. Math., Sunny Beach, (1979) 5-13 (in Bulgarian).
• Extension of minimal ring topologies, General topology and its relations to modern analysis and algebra, V (Prague, 1981), 132--144, Sigma Ser. Pure Math., 3, Heldermann, Berlin, 1983.
• Minimal topological rings, Serdica 8, (1982) 139-165.
• Totally minimal topological groups, Annuaire Univ. Sofia Fac. Math. Méc. 69, (1974/75) 5-11 (jointly with Iv. Prodanov).
• A class of compact abelian groups, Annuaire Univ. Sofia, Fac. Math. Méc. 70, (1975/76) 191-206 (jointly with Iv. Prodanov).
• A-classes of minimal abelian groups, Annuaire Univ. Sofia Fac. Math. Méc. 71, part II, (1976/77) 53-62 (jointly with L. Stoyanov).
• A topological characterization of p-adic numbers and an application to minimal Galois extensions, Annuaire Univ. Sofia, Fac. Math. Méc. 73, (1979) 103-110.
• Criterion for minimality of all subgroups of a topological abelian group, C. R. Acad. Bulgare Sci. 34, (1981) 635-638 (jointly with L. Stoyanov).
• Rings with only ideal topologies, Comm. Math. Univ. S. Pauli, 29, n. 2 (1980), 157-167 (jointly with W. Wieslaw).
• Invariant ideals and the variety of complexes, Bollettino U. M. I. (6) 2-B (1983) 33-50 (jointly with E. Ballico)
• On a property of the one-dimensional torus, Rend. Sem. Mat. Univ. Padova 69, (1983) 277-288 (jointly with N. Rodinò)
• On a class of finite-dimensional compact abelian groups, Topology, theory and applications (Eger, 1983), 215--231, Colloq. Math. Soc. János Bolyai, 41, North-Holland, Amsterdam-New York, 1985.
• Closure operators induced by topological epireflections, Topology, theory and applications, (Eger, 1983), 233-246, Coll. Math. Soc. János Bolyai 41, North-Holland, Amsterdam-New York, 1985 (jointly with E. Giuli).
• Minimal topologies on divisible groups, Lecture Notes in Mathematics, Vol. 1060, Springer-Verlag, Berlin, (1984) 216-226.
• Minimalizable topological groups, Suppl. Rend. del Circolo Mat. di Palermo 4, (1984) 43-57.
• Sugli anelli linearmente compatti, Suppl. Rend. del Circolo Mat.di Palermo, Ser. II, 4, (1984), 59-74 (jointly with A. Orsatti).
• Compact groups with totally dense torsion part, Proc. Baku Topology Conf. (1987) 231-238 (jointly with L. Stoyanov).
• Sur la minimalité des produits de groupes topologiques abéliens, C. R. Acad. Sci. Paris 299, Série I, (1984) 303-306.
• Epimorphisms and cowellpoweredness of epireflective subcategories of Top, Supp. Rend. Circolo Mat. Palermo, Serie II, 6 (1984) 151-167 (jointly with E. Giuli).
• On the structure of linearly compact rings and their dualities, Rend. Accad. Naz. dei XL, Memorie di Mat., 102, vol. VIII, fasc. 9, (1984) 143-184 (jointly with A. Orsatti).
• On a conjecture of Prodanov, C. R. Acad. Bulgare Sci. 38, (1985) 1117-1120.
• Quotients of minimal topological groups, Proc. 14 Conf. of the Union of Bulg. Math., Sunny Beach, (1985) 234-237 (in collab. con N. Rodinò).
• Ordinal invariants and epimorfisms in some categories of weak Hausdorff spaces, Comm. Math. Univ. Carolinae 27 (1986) 395-417 (jointly with E. Giuli).
• Non-completeness measure of convergence abelian groups, General topology and its relations to modern analysis and algebra, VI (Prague, 1986), 125--134, R \& E Res. Exp. Math., 16, Heldermann, Berlin, 1988.
• On convergence groups with dense coarse subgroups, Czechoslovak J. Math. 37(112), (1987) 471-479 (jointly with R. Fri\v c e F.Zanolin).
• Sequentially closed and absolutely closed spaces, Bollettino U.M.I. (7) 1-B (1987), 849-860 (jointly with Iv. Gotchev).
• Closure operators I, Topology Appl. 27 (1987) 129-143 (jointly with E.Giuli).
• Topological categories and closure operators, Quaestiones Mathematicae, 11 (1988) 323-337 (jointly with E. Giuli e A. Tozzi).
• S(n)-\theta-closed spaces, Topology Appl. 28 (1988) 59-74 (jointly with E. Giuli).
• On an unpublished manuscript of Ivan Prodanov concerning locally compact modules and their dualities. Comm. Algebra, 17 (1989) 2739-2771 (jointly with A. Orsatti).
• Radicals and duality, General Algebra 1988, R. Mlitz (Ed.), Elsevier Sci. Publ. (North-Holland) 1990, p. 45-64.
• Compactness, minimality and closedness with respect to a closure operator, in: J. Adamek and S. MacLane ed., Categorical topology and its relation to analysis, algebra and combinatorics, (Prague, 1988), 284--296 , World Sci. Publishing, Teaneck, NJ, 1989 (jointly with E. Giuli).
• Closure operators II, in: J. Adamek and S. MacLane ed. Categorical topology and its relation to analysis, algebra and combinatorics (Prague, 1988), 297--335, World Sci. Publishing, Teaneck, NJ, 1989 (jointly with E. Giuli e W. Tholen).
• Epimorphic order in S(\alpha), in: Proc. Conf. Mem. L. Chakalov 1886-1986, Sofia, January 1986, 57-65.
• Products of minimal abelian groups, Math. Zeit. 204 (1990) 583-603 (jointly with D. Shakhmatov).
• Pseudocompact topologizations of groups, Vestnik radova filozofskog fakulteta u Ni\v su, 4 (1990) 83-95 (jointly with D. Shakhmatov).
• Density and total density of the torsion part of a compact group, Rend. Accad. Naz. dei XL, Memorie di Mat. 108, Vol. XIV, fasc. 13 (1990) 235-252.
• Critical power of minimality of countably compact and pseudocompact groups, Comp. Rend. Acad. Sci. Bulg., 41, n. 10 (1990) 13-15 (jointly with D. Shakhmatov).
• Kasch bimodules, Rend. Sem. Mat. Univ. Padova, 85 (1991) 147-160 (jointly with E. Gregorio e A. Orsatti).
• Factorizations, injectivity and compactness in categories of modules. Comm. Algebra 19 (1), (1991) 45-83 (jointly with E. Giuli).
• Compact-like totally dense subgroups of compact groups, Proc. Amer. Math. Soc. 114, no. 4 (1992) 1119-1129 (jointly with D. Shakhmatov)
• Pseudocompact and countably compact abelian groups: Cartesian products and minimality, Trans. Amer. Math. Soc. 335, (1993) 775-790 (jointly with D. Shakhmatov).
• Semiregular closure operators and epimorphisms in topological categories invited lecture at Topology Conference, Lecce (Italy), 1990, Suppl. Rend. Circ. Mat. Palermo, Serie II, n. 29 (1992) 105-160.
• Isomorphisms between finite powers of connected, totally minimal, pseudocompact, Abelian groups, talk given at Topology Conference, Lecce (Italy), 1990, Suppl. Rend. Circ. Mat. Palermo, Serie II, n. 29 (1992) 385-398 (jointly with N. Rodinò).
• Inclusions preserving epimorphisms, Proc. Topol. Conf. Baku, (USSR), (1987) 220-230 (jointly with E. Giuli)
• Epimorphisms in categories of convergence spaces, Acta Math. Hung. 61 (3-4) (1993), 197-203 (jointly with E. Giuli).
• On the lattice of linear module topologies, Comm. Algebra 21, (1) (1993) 275-298 (jointly with A. Tonolo).
• Dimension and connectedness in pseudo-compact groups, Comp. Rend. Acad. Sci. Paris, 316, Série I (1993) 309-314.
• Zero-dimensionality of some pseudocompact groups, Proc. Amer. Math. Soc. 120, n. 4 (1994) 1299-1308.
• Connectedness and disconnectedness in pseudocompact groups, Rend. Accad. Naz. dei
• Pseudocompact topologies on groups, Topology Proc. 17 (1992) 335-342 (jointly with D. Shakhmatov).
• Classes of abelian groups related to sequential convergence, Comm. Algebra, 22 (15) (1994) 6073-6090.
• The category of S(\alpha)-spaces is not cowellpowered, Topology Appl., 61 (1995) 137-150. (jointly with S. Watson).
• Convergence Groups: Sequential Compactness and Generalizations, International Conference on Topology, Trieste 1993, Rend. Ist. Matematico Univ.di Trieste, 25 (1993) 141-173.
• Uniformly approachable functions and UA spaces, in: International Conference on Topology, Trieste 1993, Rend. Ist. Matematico Univ.di Trieste, 25 (1993) 23-56 (jointly with Alessandro Berarducci).
• The lattice of compact representations of an infinite group, in: Groups '93 Galway/St. Andrews, Vol. 1 (Galway, 1993), 138--155, London Math. Soc. Lecture Note Ser. 211, Cambridge Univ. Press, Cambridge, 1995.
• Isomorphisms between homeomorphic topological groups, in: F. de Giovanni and M. Newell, Eds., Infinite Groups 1994 (Ravello), 33--39, de Gruyter, Berlin, 1996 (jointly with V. Uspenskij).
• On the poset of precompact group topologies, Topology with Applications, (Szekszárd 1993), 135--149, Bolyai Soc. Math. Stud., 4, János Bolyai Math. Soc., Elsevier, Amsterdam-Budapest, 1995.
• Uniqueness of dualities, in: A. Facchini and C. Menini ed., Abelian Groups and Modules, Proc. of the Padova Conference, Padova, Italy, June 23-July 1, 1994, Mathematics and its Applications, vol. 343, Kluwer Academic Publishers, Dordrecht-Boston-London, The Netherlands, 1995, pp. 123-133.
• The impact of closure operators on the structure of a concrete category, Quaestiones Mathematicae 18 (1995) 381-396 (jointly with J. Pelant).
• On a characterization of linear compactness, Rivista di Matematica Pura ed Applicata 17 (1995) 95-106 (jointly with A. Tonolo).
• On the structure of linearly compact rings and their dualities, Abelian Groups and Modules, Proc. Udine Conf., Udine (Italy) April 1984, Springer Verlag, New York-Wien, 415-439 (jointly with A. Orsatti).
• Uniformly approachable functions, in: G.Choquet, G.Godefroy, M. Rogalski, J. Saint Raymond, Eds. Publications Mathematiques de l'Univ. Pierre et Marie Curie, Seminaire d'Initiation a l'Analyse, 33éme Année (1993/1994) pp. 7-01--7-09 (jointly with A. Berarducci).
• Uniformly approachable maps, Topology Proc., 20 (1995) 75-89 (jointly with K. Ciesielski).
• Complementation in the lattice of Equivalence Relations, Discr. Math. 159 (1996) 83-94 (jointly with Alberto Policriti).
• Categories with sufficiently many absolutely closed objects, Cahiers Topologie Géometrique Differencielle Catégoriques, Vol. XXXVIII-4 (1997) 277-300 (jointly with Jan Pelant).
• Chains of pseudocompact group topologies, Journal of Pure and Appl. Algebra 124 (1998) 65-100.
• Categorically compact topological groups, Journal of Pure and Appl. Algebra 126 (1998) 149-168 (jointly with V. Uspenskij).
• Cardinal invariants and independence results in the lattice of precompact group topologies, Journal of Pure and Appl. Algebra 126 (1998) 19-49 (jointly with A. Berarducci e M. Forti e S. Watson).
• Compactness and connectedness in topological groups, Topology Appl. 84 (1998) 227-252;
• Recent advances in minimal topological groups, Topology Appl. 85 (1998) 53--91.
• Quotients of zero-dimensional precompact abelian groups, Topology Appl. 86, n.1 (1998) 47--62.
• Classes of functions characterized by images of the sets, Colloq. Mathematicum, Vol. 77 (1998) 211--232 (jointly with K. Ciesielski e S. Watson),
• Generators of topological groups, Kazuhiro Kawamura, ed., RIMS Kokyuroku (Proceedings), vol. 1074 (1999), Symposium on General and Geometric Topology, Kyoto, March 4-6, 1998, pp. 102--125.
• On a generalization of perfect maps, in: G. Di Maio and L. Holá Editors, Recent progress in function spaces, Quaderni di Matematica, vol. 3, Dipartimento di Matematica, Seconda Univeritá di Napoli, 1998, pp. 35-54.
• Minimality with respect to a bireflector: T-minimal and \nu-coarse groups, Proceedings Symposium on Categorical Topology SoCaT 94 (Festschrift: On the occasion of the 60th birthday of Guillaume Brümmer) Published by: Department of Mathematics and Applied Mathematics, University of Cape Town -- April 1999, pp. 75--87 (jointly with R. Fri\v c).
• On the minimality of the powers of the minimal \omega-bounded abelian groups, Proc. Amer. Math. Soc. 127 (1999) 3101--3110 (jointly with A. Tonolo).
• Countably compact groups satisfying the open mapping theorem, Topology Appl. 98 (1999) 81-129.
• Some topological groups with and some without suitable sets, (joint paper with M. Tkachenko and V. Tkachuk), in Topology Appl., 98 (1999) 131--148.
• On the poset of totally dense subgroups of compact groups, Topology Proc. 24 (1999), 103--128 (jointly with W. Comfort).
• Sequential completeness of quotient groups, Bull. Austral. Math. Soc. 61 (2000), 129--151 (joint paper with M. Tkachenko);
• Topological groups with thin generating sets, Jour. Pure Appl. Algebra 145, n. 2 (2000) 123--148 (jointly with M. Tkachenko and V. Tkachuk);
• Suitable sets in some topological groups, Journal of Group Theory, 3 (2000) 293-321 (jointly with J. Trigos).
• Essential subgroups of topological groups, Comm. Algebra, 28(10) (2000) 4941-4970 (jointly with E. Boschi).
• Epimorphisms and cowellpoweredness in quasi uniform spaces, in: Guillaume Brümmer and Christopher Gilmour, eds., Papers in Honour of Bernhard Banaschewski, "Proceedings of the BB Fest 96, a conference held at the University of Cape Town", 15-20 July 1996, on Category Theory and its Applications to Topology, Order and Algebra, Applied Categotrical Structures, 8, n 1-2 (2000) pp. 33 (jointly with H.-P. Künzi).
• The lattice of group topologies and compact representations, in "Nuclear groups and Lie groups. Current result and problems", Proceedings of the Workshop on topological groups and Lie groups, Madrid (Spain), September 20-25, 1999, Research & Exposition in Mathematics, vol. 24 (2001) pp. 105--126 , Heldermann Verlag Berlin.
• Absorbtion adjunctable groups, in: "Nuclear groups and Lie groups. Current result and problems", Proceedings of the Workshop on topological groups and Lie groups, Madrid (Spain), September 20-25, 1999, Research & Exposition in Mathematics, vol. 24 (2001) pp. 77--103, Heldermann Verlag Berlin, (jointly with Eusebio Corbacho and Vaja Tarieladze).
• Locally compact abelian groups admitting totally suitable sets, Journal of Group Theory, 4 (2001) 59-73 (jointly with E. Boschi).
• Sequentially complete groups: dimension and minimality, Jour. Pure Appl. Algebra 157 (2001), 215-239 (jointly with M. Tkachenko).
• Weak completeness of free topological groups, Topology Appl. 112, n. 3 (2001) 259-287 (jointly with M. Tkachenko).
• Between continuous and uniformly continuous functions on R^n, Topology Applications 114, n. 3 (2001) 311-325 (jointly with K. Ciesielski).
• Characterization of the tori by density of the set of solutions of linear equations, in: Abelian Groups, Rings and Modules: AGRAM 2000 Conference, July 9-15, 2000 Perth, Western Auatrslia, Contemporary Mathematics (Amer. Math. Soc.) vol. 273 (2001) 107-116 (jointly with M. Tkachenko).
• Solution to van Douwen's problem on Bohr topologies, Jour. Pure Appl. Algebra, 163, n. 2 (2001), 147-158 (jointly with S. Watson).
• Continuous maps in the Bohr Topology, Applied General Topology 2, n. 2 (2001), 237-270.
• Varieties generated by countably compact Abelian groups, Proc. Amer. Math. Soc., 130 (2002), 2487-2496 (jointly with M. Tkachenko).
• Functions with distant fibers and uniform continuity, Topology Appl., 121, n. 1-2 (2002) 3-23 (jointly with A. Berarducci e J. Pelant).
• Uniform quasi components, thin spaces and compact separation, Topology Applications 122 (2002), 51-64 (jointly with A. Berarducci e J. Pelant).
• Essential density and total density in topological groups, J. Group Theory, 5 n. 3 (2002) 325-350 (jointly with W. Comfort).
• Functorial topologies on abelian groups, Proceedings of SUNLAG 2000, a spring stage on Algebra, Logic and Geometry, March 2000, Seconda Univeritá di Napoli, 2002, pp. 81-95.
• Topological groups and their generators, in: M. Curzio and F. De Giovanni Editors, Topics in Infinite Groups, Quaderni di Matematica, vol. 4, Dipartimento di Matematica, Seconda Univeritá di Napoli, 2001, pp. 101-173, (jointly with C. Milan).
• Dualities of locally compact modules over the rationals, J. Algebra, 256 (2002) pp. 433-466 (jointly with C. Milan).
• A class of abelian groups defined by continuous cross sections in the Bohr topology, Rocky Mountain J. Math. 32 (2002), no. 4, 1331--1355.
• Subgroups of products of locally compact groups, Topology Proc. 26 (2001-2002) 533--544 (jointly with S. Morris).
• Topologically torsion elements of topological groups, Topology Proc. 26 (2001-2002) 505--532.
• Answer to Raczkowski's quest on convergent sequences of integers, Topology Appl. 132 (2003), no. 1, 89--101 (jointly with G. Barbieri, C. Milan and H. Weber).
• Algebraic structure of small countably abelian compact groups, Forum Math., 15 (2003), 811-837 (jointly with M. Tkachenko).
• Groups with a small set of generators, Applied General Topology, 4, n. 2 (2003), 327-350 (jointly with U. Marconi and R. Moresco).
• Answer to Armacost's quest on topologically torsion elements of the circle group, Comm. Algebra 32 (2004) 133-146(jointly with R. Di Santo).
• Topological groups, in: Encylopedia of General Topology, Elsevier.
• On a property of the adele ring of the rationals, Rings, Modules, Algebras and Abelian Groups, Proceedings of the Algebra Conference -- Venezia, ``Lecture Notes in Pure and Applied Mathematics", vol. 236, Marcel Dekker 2004, pp. 133-137 (jointly with Umberto Zannier).
• An additivity theorem for uniformly continuous functions, Topology Appl. 146/147 (2005), 339--352 (jointly with A. Berarducci e J. Pelant).
• Forcing hereditarily separable countably compact group topologies on Abelian groups, Topology Appl. 151 (2005), no. 1-3, 2--54 (jointly with Dmitri Shakhmatov).
• A characterization of the MAP abelian groups, J. Pure Appl. Algebra, 197 (2005), no. 1-3, 23--41(jointly with C. Milan and A. Tonolo).
• Convergent sequences in precompact group topologies. Appl. Gen. Topol. 6 (2005), no. 2, 149--169 (jointly with G. Barbieri, C. Milan and H. Weber).
• On transversal group topologies,  Topology Appl., 153 (2005), no. 5-6, 786--817. (jointly with M. Tkachenko and V. Yaschenko).
• Weakly metrizable pseudocompact groups, Appl. Gen. Topol. 6, no. 2, (2006), 1-31 (jointly with A. Giordano Bruno and C. Milan)
• Closure operators in topological groups related to von Neumann's kernel,Topology Appl., 153 (2006), no. 11, 1930--1955.
• t-dense subgroups of topological Abelian groups, Q & A General Topology, vol. 24, n. 2 (2006) 99-118 (jointly with G. Barbieri, C. Milan and H. Weber).
• Transversal group topologies of non-abelian groups, Topology Appl. 153 (2006) 3338--3354 (jointly with M. Tkachenko and V. Yaschenko).
• Every infinite group can be generated by a P-small subset, Appl. Gen. Topol., Volume 7, No. 2 (2006) 265-268 (jointly with I. Protasov).
• Local connectedness and extension of uniformly continuous functions, Topology Appl. 153 (2006) 3355--3371 (jointly with A. Berarducci e Jan Pelant)
• Torsion theories and radicals in normal categories, J. Algebra 305 (2006), no. 1, 98--129 (jointly with M. M. Clementino e W. Tholen)
• Charactrizing subgroups of the compact abelian groups, J. Pure Appl. Algebra, 208 (2007) 285--291 (jointly with K. Kunen)
• CLP-compactness for topological spaces and groups, Topology Appl. 154 (2007)1321--1340
• Selected topics from the structure theory of topological groups, in E.Perl, ed., Open Problems in Topology 2, Elsevier 2007, pp. 389-406 (in collab. con D. Shakhmatov)
• Weight of closed subsets algebraically generating a dense subgroup of a compact group, Math. Nachrichten 280, Issue 5-6 (2007) 505 - 522 (jointly with D. Shakhmatov).
• On Conway's question, Appl. Cat. Structures, vol. 15, no. 5-6 (2007) 511-539 (jointly with E. Peinador e Vaja Tarieladze)
• w-Divisible groups, Topology Appl. 155, Issue: 4 (2008) 252-272 (jointly with A. Giordano Bruno)
• Pseudocompact totally dense subgroups. Proc. Am. Math. Soc., vol. 136, no. 3 (2008) 1093-1103 (jointly with A. Giordano Bruno)
• Topological torsion related to some recursive sequences of integer, Math. Nachrichten 281, Issue 7 (2008) 930-950 (jointly with G. Barbieri, C. Milan and H. Weber)
• Reflection principle characterizing groups in which unconditionally closed sets are algebraic, J. Group Theory 11 (2008), 421-442 (jointly with D. Shakhmatov).
• Straightening theorem for bounded abelian groups}, Topology Appl. 155, Issues 17-18 (2008) 2158-2176 (jointly with L. De Leo).
• Counting maximal topologies on countable groups and rings, Topology Appl. (2008) 156 (2008) 322--325 (jointly with Igor Protasov)
• Algebraic entropy of endomorphisms of abelian groups, to appear in Trans. AMS (jointly with Brendan Goldsmith, Luigi Salce e P. Zannardo)
• A characterization of circle group via uniqueness of roots, Topology Appl. to appear (jointly with Di Santo).
• Products of straight spaces, to appear in Topology Appl. (jointly with A. Berarducci e Jan Pelant).
• Relatively minimal subgroups of topological groups, to appear in Topology Appl., (jointly with M. Megrelishvili).
• Arnautov's problems on semitopological isomorphisms, to appear in Applied General Topology (jointly with A. Giordano Bruno)
• Minimal pseudocompact group topologies on free abelian groups, to appear in Topology Appl. (jointly with A. Giordano Bruno and D. Shakhmatov).
• Countably infinite quasi-convex sets in some locally compact abelian groups, to appear in Topology Appl. (jointly with L. de Leo)
• Hewitt-Marczewski-Pondiczery type theorem for abelian groups and Markov's potential density, to appear in Proc. Amer. Math. Soc. (jointly with D. Shakhmatov).
• The Markov-Zariski topology of an abelian group, to appear in J. Algebra (jointly with D. Shakhmatov)
• Quasi convex convergent sequences in compact abelian groups, to appear in Topology Appl. (jointly with G. Luka'cs).
• Locally compact abelian groups admitting non-trivial quasi-convex null sequences, to appear in Jour Pure Appl. Alg. (jointly with G. Luka'cs).

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