Hoyenko, N.     Approximation of appell hypergeometric function F1 by branched continued fractions [Текст] / N. Hoyenko, V. Hladun, L. Manzij // Functional methods in approximation theory and operator theory III : conf., dedicated to yhe memory of V.K. Dzyadyk (1919-1998), Aug. 22-26, 2009, Svityaz, Volyn, Ukraine / Nat. T. Shevchenko Univ. of Kyiv, Inst. of Mathematics of NAS of Ukraine, Volyn Nat. Univ of L. Ukrainka. — Kyiv, 2009. — P. 48-49.