Solich, K. V. (2012) “Estimates for bilinear approximations of the classes TeX of periodic functions of two variables”, Ukrains’kyi Matematychnyi Zhurnal, 64(8), pp. 1106-1120. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2644 (Accessed: 25April2024).