43 citations to https://www.mathnet.ru/rus/sm1728
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Kalyagin V., “Characteristics of Spectrum of High-Order Difference-Operators and Convergence of Simultaneous Rational Approximants”, Dokl. Akad. Nauk, 340:1 (1995), 15–17
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В. А. Калягин, “Аппроксимации Эрмита–Паде и спектральный анализ несимметричных операторов”, Матем. сб., 185:6 (1994), 79–100 ; V. A. Kalyagin, “Hermite–Padé approximants and spectral analysis of nonsymmetric operators”, Russian Acad. Sci. Sb. Math., 82:1 (1995), 199–216
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A. I. Aptekarev, Herbert Stahl, Springer Series in Computational Mathematics, 19, Progress in Approximation Theory, 1992, 127