On Singularities of a Boundary of the Stability Domain. - Alexei A. Mailybaev; Alexander P. Seyranian (SIAM J. Matrix Anal. Appl., 1999)

Collapse of the Keldysh Chains and Stability of Continuous Nonconservative Systems. - Alexander P. Seyranian; Oleg N. Kirillov (SIAM J. Appl. Math., 2004)