1. Algebraic characterizations of fixed modes in decentralized control;Anderson;Automatica,1979
2. Fixed modes and local feedbacks in interconnected systems;Calogiannis;Int. J. of Control,1982
3. Characterizations of decentralized fixed modes for interconnected systems;Davison;Automatica,1983
4. Stabilization with LLSVF: The state of the art and some open problems;Fessas;Fachberich Nr 82-04 AIE/ETH,1982