1. Phase-variable canonical transformation of multicontroller system;Asseo;IEEE Trans. Autom. Control,1968
2. Matrix Polynomial;Gohberg,1982
3. Feedback Systems: Input-Output Properties;Desoer,1975
4. Multivariable zeros and their properties;Patel,1977
5. State Space and Multivariable Theory;Rosenbrock,1970