The 2 references without contexts in paper J. Emelianova P., Ю. Емельянова П. (2016) “Устойчивость нелинейных повторяющихся процессов с возможными нарушениями // Stability of nonlinear repetitive processes with possible failures” / spz:neicon:technomag:y:2014:i:4:p:398-415

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Pakshin P.V., Galkovski K., Rogers E. [Linear-quadratic parametrization of stabilizing controls in discrete-time 2D systems].Avtomatika i telemekhanika, 2011, no. 11, pp. 157{173. (English translation:Automation and Remote Control, 2011, vol. 72, iss. 11, pp. 2364{2378. DOI: 10.1134/S0005117911110117).
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Boyd S., El Ghaoui L., Feron E., Balakrishnan V.Linear Matrix Inequalities in System and Control Theory. Philadelphia, SIAM, 1994. 193 p.
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