2 citations to https://www.mathnet.ru/rus/zvmmf1623
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Б. З. Шаваровский, “Решение систем линейных однородных двусторонних матричных уравнений с двумя неизвестными”, Ж. вычисл. матем. и матем. физ., 44:11 (2004), 1950–1963 ; B. Z. Shavarovskii, “Solving systems of linear homogeneous two-sided matrix equations with two unknowns”, Comput. Math. Math. Phys., 44:11 (2004), 1853–1866
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Ikramov K.D., Savel'eva N.V., “The inertia of matrices and quadratic forms, conditionally definite matrices, the separation of the roots of algebraic equations, and MAPLE procedures”, Program Comput Softw, 26:1 (2000), 23–24