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3. B. T. Polyak, “International symposium on Robustness in Identification and Management, Siena, Italy, July 30–Aug. 2, 1998,” Avtom. Telemekh., No. 8, 185–193 (1999).
4. V. A. Podchukaev, Analytical Methods of the Automatic Control Theory (Fizmatlit, Moscow, 2002) [in Russian].
5. B. T. Polyak and P. S. Shcherbakov, Robust Stability and Control (Nauka, Moscow, 2002) [in Russian].