Selected publications
Monographs
Topological Groups: Characters, Dualities and Minimal Group Topologies,
Pure and Applied Mathematics, Vol. 130 , Marcel
Dekker Inc. , New YorkBasel, 1990, pp. x+287, ISBN: 0824780477
(jointly with Iv. Prodanov e L. Stoyanov)
Categorical Structure of Closure Operators with Applications to Topology,
Algebra and Discrete Mathematics, Mathematics and its Applications,
vol. 346, Kluwer Academic Publishers , DordrechtBostonLondon
1995, pp. 358+xviii, ISBN: 0792337727 (jointly with W. Tholen)
Algebraic structure of the pseudocompact groups, Memoirs
Amer. Math. Soc. , 133/633, April 1998, pp. viii+83 (jointly
with D. Shakhmatov).
Editor of Proceedings
Abelian Groups, Module Theory and Toplogical Algebra,
Proceedings in Honour of Adalberto Orsatti's 60th Birthday, Padova
1921 June 1997, ``Lecture Notes in Pure and Applied Mathematics", vol.
201, Marcel Dekker, New York 1998, xviii+444 pp. ISBN: 0824719379
(jointly with L. Salce).
Selected papers

A class of compact abelian groups, Annuaire Univ. Sofia,
Fac. Math. Méc. 70, (1975/76) 191206 (jointly with Iv. Prodanov).

Minimal topologies on divisible groups, Lecture Notes
in Mathematics, Vol. 1060, SpringerVerlag, Berlin, (1984) 216226.

Sur la minimalité des produits de groupes topologiques
abéliens, C. R. Acad. Sci. Paris 299, Série I, (1984)
303306.

On the structure of linearly compact rings and their dualities,
Rend. Accad. Naz. dei XL, Memorie di Mat., 102, vol. VIII, fasc.
9, (1984) 143184 (jointly with A. Orsatti).

On a conjecture of Prodanov, C. R. Acad. Bulgare Sci.
38, (1985) 11171120.

Closure operators I, Topology Appl. 27 (1987) 129143
(jointly with E.Giuli).

S(n)\thetaclosed spaces, Topology Appl. 28 (1988)
5974 (jointly with E. Giuli).

On an unpublished manuscript of Ivan Prodanov concerning
locally compact modules and their dualities. Comm. Algebra, 17 (1989)
27392771 (jointly with A. Orsatti).

Products of minimal abelian groups, Math. Zeit. 204
(1990) 583603 (jointly with D. Shakhmatov).

Compactlike totally dense subgroups of compact groups, Proc.
Amer. Math. Soc. 114, no. 4 (1992) 11191129 (jointly with D. Shakhmatov)

Pseudocompact and countably compact abelian groups: Cartesian
products and minimality, Trans. Amer. Math. Soc. 335, (1993) 775790
(jointly with D. Shakhmatov).

Dimension and connectedness in pseudocompact groups, Comp.
Rend. Acad. Sci. Paris, 316, Série I (1993) 309314.

Zerodimensionality of some pseudocompact groups, Proc. Amer. Math. Soc. 120, n. 4 (1994) 12991308.

Classes of abelian groups related to sequential convergence, Comm. Algebra, 22 (15) (1994) 60736090.

The category of S(\alpha)spaces is not cowellpowered, Topology Appl., 61 (1995) 137150. (jointly with S. Watson).

Isomorphisms between homeomorphic topological groups, in: F. de Giovanni and M. Newell, Eds., Infinite Groups 1994(Ravello),
3339, de Gruyter, Berlin, 1996 (jointly with V. Uspenskij).

Uniqueness of dualities, in: A. Facchini and C. Menini ed., Abelian Groups and Modules, Proc. of the Padova Conference, Padova,
Italy, June 23July 1, 1994, Mathematics and its Applications, vol. 343, Kluwer Academic Publishers, DordrechtBostonLondon, The Netherlands,
1995, pp. 123133.

Complementation in the lattice of Equivalence Relations, Discr. Math. 159 (1996) 8394 (jointly with Alberto Policriti).

Chains of pseudocompact group topologies, Journal of Pure and Appl. Algebra 124 (1998) 65100.

Categorically compact topological groups, Journal of Pure and Appl. Algebra 126 (1998) 149168 (jointly with V. Uspenskij).

Cardinal invariants and independence results in the lattice of precompact group topologies, Journal of Pure and Appl. Algebra126
(1998) 1949 (jointly with A. Berarducci e M. Forti e S. Watson).

Compactness and connectedness in topological groups, Topology Appl. 84 (1998) 227252;

Recent advances in minimal topological groups, Topology Appl. 85 (1998) 5391.

Quotients of zerodimensional precompact abelian groups, Topology Appl. 86, n.1 (1998) 4762.

Classes of functions characterized by images of the sets, Colloq. Mathematicum, Vol. 77 (1998) 211232 (jointly with K. Ciesielski
e S. Watson),

Countably compact groups satisfying the open mapping theorem, Topology Appl. 98 (1999) 81129.

On the minimality of the powers of the minimal \omegabounded abelian groups, Proc. Amer. Math. Soc. 127 (1999) 31013110 (jointly
with A. Tonolo).

Some topological groups with and some without suitable sets, Topology Appl., 98 (1999) 131148 (jointly with M. Tkachenko and
V. Tkachuk).

On the poset of totally dense subgroups of compact groups, Topology Proc., 24 (1999), 103128 (jointly with W. Comfort).

Sequential completeness of quotient groups, Bull. Austral. Math. Soc. 61 (2000), 129151 (jointly with M. Tkachenko).

Topological groups with thin generating sets, Jour. Pure Appl. Algebra 145, n. 2 (2000) 123148 (jointly with M. Tkachenko
and V. Tkachuk).

Suitable sets in some topological groups, Journal of Group Theory, 3 (2000), 293321 (jointly with J. Trigos).

Essential subgroups of topological groups, Comm. Algebra,
28(10) (2000) 49414970 (jointly with E. Boschi).

Locally compact abelian groups admitting totally suitable sets, Journal of Group Theory, 4 (2001) 5973 (jointly with E. Boschi).

Sequentially complete groups: dimension and minimality, Jour. Pure Appl. Algebra 157 (2001), 215239 (jointly with M. Tkachenko).

Weak completeness of free topological groups, Topology Appl., 112, Issue 3 (2001) 259287 (jointly with M. Tkachenko).

Characterization of the tori by density of the set of solutions of linear equations, in: Abelian Groups, Rings and Modules: AGRAM 2000
Conference, July 915, 2000 Perth, Western Auatrslia, Contemporary Mathematics
(Amer. Math. Soc.) vol. 273 (2001) 107116 (jointly with M. Tkachenko).

Between continuous and uniformly continuous functions on
R^n, Topology Appl., 114, n. 3 (2001) 311325 (jointly with
K. Ciesielski).

Solution to van Douwen's problem on Bohr topologies, Jour. Pure Appl. Algebra, 163, n. 2 (2001), 147158 (jointly with S. Watson).

Varieties generated by countably compact Abelian groups,
Proc. Amer. Math. Soc., 130 (2002), 24872496 (jointly with M. Tkachenko).
 Functions with distant fibers and uniform continuity, Topology
Appl., 121, n. 12 (2002) 323 (jointly with A. Berarducci e J. Pelant).

Essential density and total density in topological groups, J. Group Theory, 5 n. 3 (2002) 325350 (jointly with W. Comfort).
 Uniform quasi components, thin spaces and compact separation,
Topology Appl. 122 (2002) 5164 (jointly with A. Berarducci e J. Pelant).

Algebraic structure of small countably abelian compact groups, Forum Math. 15 (2003), 811837 (jointly with M. Tkachenko).

A class of abelian groups defined by continuous cross sections in the Bohr topology, Rocky Mountain J. Math. 32, n. 4 (2002) 13311355.

Dualities of locally compact modules over the rationals, J. Algebra, 256 (2002) 433466 (jointly with C. Milan).

Answer to Armacost's quest on topologically torsion elements of the circle group, Comm. Algebra,32 (2004) 133146 (jointly with R. Di
Santo).

Answer to Raczkowski's quest on convergent sequences of integers, Topology Appl, 132 (2003), no. 1, 89101 (jointly with G. Barbieri, C. Milan and H. Weber).

Topological groups, in: Encylopedia of General Topology, Elsevier.

On a property of the adele ring of the rationals, Proc. Venice Conference of Algebra 2002, ``Lecture Notes in Pure and Applied Mathematics", vol. 236, Marcel Dekker pp. 133137 (jointly with Umberto Zannier).

An additivity theorem for uniformly continuous functions, Topology Appl. 146/147 (2005), 339352 (jointly with A. Berarducci e J. Pelant).

A characterization of the MAP abelian groups, J. Pure Appl. Algebra 197 (2005), no. 13, 2341 (jointly with C. Milan and A. Tonolo).

Forcing hereditarily separable countably compact group topologies on Abelian groups,Topology Appl. 151 (2005), no. 13, 254. (jointly with Dmitri Shakhmatov).

On transversal group topologies Topology Appl. 153 (2005), no. 56, 786817
(jointly with M. Tkachenko and V. Yaschenko).

Closure operators in topological groups related to von Neumann's kernel,
Topology Appl. 153 (2006), no. 11, 19301955.

Charactrizing subgroups of the compact abelian groups J. Pure Appl. Algebra 208 (2006) 285291 (jointly with K. Kunen).

Transversal group topologies of nonabelian groups, Topology Appl. 153 (2006) 33383354 (jointly with M. Tkachenko and V. Yaschenko).

Local connectedness and extension of uniformly continuous functions, Topology Appl. 153 (2006) 33553371 (jointly with A. Berarducci and Jan Pelant)

Torsion theories and radicals in normal categories, J. Algebra 304 (2006), no. 1, 98129.
(jointly with M. M. Clementino e W. Tholen)

CLPcompactness for topological spaces and groups, to appear in Topology Appl.

On Conway's question: a chase for completeness, Appl. Cat. Structures vol. 15, no. 56 (2007) 511539 (jointly with E. Peinador e V. Tarieladze).

Pseudocompact totally dense subgroups}, Proc. Amer. Math. Soc., vol. 136, no. 3 (2008) 10931103 (jointly with A. Giordano Bruno)

Topological torsion related to some recursive sequences of integers}, Math. Nachrichten 281, Issue 7 (2008) 930950 (jointly with G. Barbieri, C. Milan e H. Weber).

Algebraic entropy of endomorphisms of abelian groups}, Trans. AMS 361 (2009), 34013434 (jointly with B. Goldsmith, L. Salce and P. Zanardo),

Quasiconvex density and determining subgroups of compact abelian groups}, J. Math. Anal. Appl. 363 (2010), no. 1, 4248 (jointly with D. Shakhmatov).

Locally compact abelian groups admitting nontrivial quasiconvex null sequences}, Jour. Pure Appl. Alg. 214 (2010) 885897 (jointly with G. Luk\' acs).

HewittMarczewskiPondiczery type theorem for abelian groups and Markov's potential density}, Proc. Amer. Math. Soc. 138 (2010), 29792990 (jointly with D. Shakhmatov).

Adjoint algebraic entropy}, J. Algebra 324 (2010) 442463 (jointly with A. Giordano Bruno, L. Salce)

Locally minimal topological groups}, J. Math. Anal. Appl. 370 (2010) 431452 (jointly with L. Au\ss enhofer, M.J. Chasco, X. Dominguez).

The MarkovZariski topology of an abelian group, J. Algebra, 324, Issue 6, (2010), 11251158 (jointly with D. Shakhmatov)

Dualities in topological groups}, Scientiae Mathematica Japonicae, 72, n. 2 (2010) 197235 (jointly with M.V. Ferrer and S. Hern\' andez).

A KroneckerWeyl theorem for subsets of abelian groups}, Adv. Math. 226 (2011) 47764795 (jointly with D. Shakhmatov).

Locally minimal topological groups}, 2, J. Math. Anal. Appl. 380 (2011) 552570, (jointly with L. Au\ss enhofer, M.J. Chasco, X. Dominguez).

On zerodimensionality and the connected component of locally pseudocompact groups}, Proc. Amer. Math. Soc. 139, n. 3 (2011) 29953008 (jointly with G. Luk\' acs).

Quasiconvexly dense and suitable sets in the arc component of a compact connected group}, Math. Nachrichten 285, No. 4, (2012) 476  485 (jointly with D. Shakhmatov).

The Pinsker subgroup of an algebraic flow, Jour Pure Appl. Algebra, 216 (2012) 364376 (jointly with A. Giordano Bruno).

Entropy in a category}, ACS, Volume 21, Issue 1 (2013), Page 67101 arXiv:1006.5122 (jointly with A. Giordano Bruno).

Metrization criteria for compact groups in terms of their dense subgroups,
Fundam. Math. 221 (2013) 161 187. (jointly with D. Shakhmatov).

Endomorphisms of abelian groups with small algebraic entropy, Jour. of Linear Algebra and Appl. 439 (2013) 18941904 (jointly with Ketao Gong and Paolo Zanardo).

Minimality conditions in topological groups}, Recent Progress in General Topology III, Hart, K.P., van Mill, Jan, Simon, P (Eds.) Springer Verlag (Atlantis Press), Berlin, 2014, pp. 229327 (jointly with Michael Megrelishvili)

Compactlike abelian groups without nontrivial quasiconvex null sequences, J. Pure Appl. Algebra 218 (2014) 135147 (jointly with Gabor Lukacs

A class of metrizable locally quasiconvex groups which are not Mackey}, Forum Math. 26 (2014), 723757 (jointly with Elena Mart\'inPeinador and V. Tarieladze),

Characterizing sequences for precompact group topologies}, J. Math. Anal. Appl. 412 issue 1, 2014. p. 505519 (jointly with S. Gabriyelyan and V. Tarieladze).

Intrinsic algebraic entropy}, Jour. Pure Appl. Algebra 219 (2015), 29332961 (jointly with A. Giordano Bruno, L. Salce, S. Virili).

Closure operators and dual closure operators, J. Algebra 439 (2015), pp. 373416 (jointly with Walter Tholen)

Complete solution of Markov's problem on connected group topologies}, Adv. Math. 286 (2016), 286307 (jointly with D. Shakhmatov).

Entropy on abelian groups, Adv. Math. 298 (2016), 612653, (arXiv:1007.0533) (jointly with A. Giordano Bruno).

Infinite direct sums and direct products in topological groups and topological vector spaces}, J. Math. Anal. Appl. 437 (2016), no. 2, 12571282 (jointly with D. Shakhmatov and J. Sp\v{e}v\'ak).

Characterizations of Lie groups, Formum Math. 30(2) ( 2018) 295320 (jointly with D. Shakhmatov).

Cowellpoweredness of some categories of quasiuniform spaces}, Applied Cat. Structures 26 (2018), no. 6, 11591184. (jointly with H. P. Kunzi).

Locally Compact Groups and Locally Minimal Group Topologies}, Fundam. Math. 244 (2019), no. 2, 109124 (jointly with W. He, W. Xi and Z. Xiao)

Hereditarily minimal topological groups}, Forum Math. 31 (2019), no. 3, 619646 (jointly with Schlossberg, Toller, W. Xi);

Quotients of locally minimal group}, J. Math. Anal. Appl. 475, Issue 2, (2019 )12151241 (jointly with D.P. W. He, Z. Xiao, W. Xi).

Dimension and entropy in compact topological group}, J. Math. Anal. Appl. 476, Issue 2, 15 (2019) 337366 (jointly with M. Sanchis).

Entropy on normed semigroups (towards a unifying approach to entropy), Diss. Math. 542 (2019), 1–90 (jointly with A. Giordano Bruno)

Scharacterized subgroup of the circle group, Fundamenta Math. 249 (2020)185209 (jointly with P. Das, and Kumardipta Bose).

Algebraic entropy of amenable semigroup actions, J. Algebra 556 (2020), 467546 (jointly with A. Giordano Bruno and A. Fornasiero),

Locally quasiconvex compatible topologies on LCA groups}, Math. Z. 296, (2020) 325351 (jointly with Lydia Aussenhofer)

Topological entropy, upper capacity and fractal dimensions of finitely generated semigroup actions, Colloq. Math. 163 (2021) 131151 (jointly with A. Bi\'s, A. Giordano Bruno and L. Stoyanov).

Finiteness of topological entropy for locally compact abelian $p$groups, Glasgow J.M. (jointly with A. Giordano Bruno and F. Russo),
DOI: https://doi.org/10.1017/S0017089520000038