1. Ali, A., Bhatia, P.K.: Astrophys. Space Sci. 191, 89 (1992)
2. Anagnosh, J.J., Desoer, C.A.: An elementary proof of Routh Hurwitz stability criterion, Electronics Research Laboratory, College of Engineering, University of California, vol. 1, p. 13 (1989); Engineering, University of California, vol. 10, p. 101
3. Anagnosh, J.J., Desoer, C.A.: An elementary proof of Routh Hurwitz’s stability criterion. Circuits Syst. Signal Process. 10, 1 (1991)
4. Bhatia, P.K.: Astron. Astrophys. 1, 399 (1969)
5. Bhatia, P.K.: Publ. Astron. Soc. Jpn. 24, 375 (1972)