1. Numerical computation of root-loci using the Newton-Raphson technique;Ash;IEEE Trans. on Auto. Control,1968
2. Characteristic loci techniques in multivariable control system design;Belletrutti;Proc. IEE,1971
3. Properties and calculation of transmission zeros of linear multivariable systems;Davison;Automatica,1974
4. Feedback Control System Analysis and Synthesis;D'Azzo,1960
5. Eigensystem Subroutine Package,1978