Makhmudov AP, Le Dyk Kiem. On the approximation by the poynomials of S. M. Bershtein type of the Hursa problem for nonlinear equation of hyperbolic type. Ukr. Mat. Zhurn. [Internet]. 1992Sep.8 [cited 2024Jul.27];44(8):1116-23. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8044