Author: Petkov, P. Hr.

Konstantinov, M. M.; Petkov, P. Hr.; Christov, N. D.: Perturbation analysis of the discrete Riccati equation. (English). Kybernetika, vol. 29 (1993), issue 1, pp. 18-29
Konstantinov, M. M.; Petkov, P. Hr.; Christov, N. D.: Invariants and canonical forms for linear multivariable systems under the action of orthogonal transformation groups. (English). Kybernetika, vol. 17 (1981), issue 5, pp. 413-424

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