1. Osnovii Avtomaticheskovo Regulirovania Teplovikh Prosesov;Dudnikov,1956
2. Design of optimal systems by a frequency-domain technique;Fallside;proc. IEE,1970
3. Optimal linear system with prescribed degree of damping or of stability;Fu;Chinese Journal of Nuclear Science and Engineering,1982
4. Optimal return difference matrix;Grimble;Proc. IEE,1977
5. A proof of the stability of multi variable feedback system;Hsu;Proc. IEEE,1963