1.
Romanyuk AS, Romanyuk VS. Best Bilinear Approximations for the Classes of Functions of Many Variables. Ukr. Mat. Zhurn. [Internet]. 2013 Dec. 25 [cited 2025 Dec. 6];65(12):1681–1699. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2546