1. Analytic Perturbation Theory for Matrices and Operators;Baumgärtel,1985
2. A classification of linear controllable systems;Brunovský;Kybernetika (Prague),1970
3. Operator models associated with Kac subclasses of generalized Nevanlinna functions;Derkach;Methods Funct. Anal. Topology,1999
4. Rank one perturbations in a Pontryagin space with one negative square;Derkach;J. Funct. Anal.,2002
5. Low rank perturbation of Jordan structure;Dopico;SIAM J. Matrix Anal. Appl.,2003