1. New algebraic criteria for positive realness;Šiljak;J. Franklin Inst.,1971
2. Discrete positive-real functions and their application to system stability;Hitz;Proc. IEE,1969
3. Network Analysis and Synthesis;Weinberg,1962
4. Geometry of Polynomials;Marden,1966
5. The Theory and Application of FSZ-Transform Methods;Jury,1964