Cenni storici
M. R. Liberzon. Essays on the absolute stability theory. Automation and Remote Control, vol. 67, n. 10, pp. 1610-1644, 2006. (http://www.springerlink.com/content/1117522816128946/)
Criteri classici in frequenza
G. Zames. On the input-output stability of time-varying nonlinear feedback systems-Part II: conditions involving circles in the frequency plane and sector nonlinearities. IEEE Transactions on Automatic Control, vol. AC-11, n. 7, pp. 465-476, 1966. (IEEE Explore)
M. G. Safonov, G. Wyetzner. Computer-aided stability analysis renders Popov criterion obsolete. IEEE Transactions on Automatic Control, vol. AC-32, n. 12, pp. 1128-1131, 1987. (IEEE Explore)
Sistemi dissipativi, positive real lemma, linear matrix inequalities
Libro di testo.
H. Khalil. Nonlinear Systems, Third Edition. Prentice Hall, 2002.