“The Pomp’eiu-Landau-Sz’asz’s extremal problem for bounded holomorphic functions in bidisk” (2015) Transactions of Institute of Mathematics, the NAS of Ukraine, 12(4), pp. 216–225. Available at: https://trim.imath.kiev.ua/index.php/trim/article/view/296 (Accessed: 9 September 2026).