2 citations to https://www.mathnet.ru/rus/rm1655
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Derevyagin M., Derkach V., “Convergence of diagonal Padé approximants for a class of definitizable functions”, Recent advances in operator theory in Hilbert and Krein spaces, Oper. Theory Adv. Appl., 198, Birkhäuser Verlag, Basel, 2010, 97–124
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Maxim Derevyagin, Vladimir Derkach, Recent Advances in Operator Theory in Hilbert and Krein Spaces, 2009, 97