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2. P.C. Parks, “A new proof of Hermite’s stability criterion and a generalization of Orlando’s formula,” Int. J. Cont., vol. 26, no. 2, pp. 197–206, 1977.
3. E.J. Routh, “A treatise on the stability of a given state of motion,” Adams Prize Essay, Univ. of Cambridge, England, 1877.
4. E.I. Jury, “Stability tests for one-two-and multi-dimensional linear systems, ” Routh Centennial Lecture, IEE Proc., vol. 124, no. 12, pp. 1237–1240, 1977.
5. Routh Centenary Issue, Int. J. Cont., vol. 26, no. 2, Sept. 1977.