VAKARCHUK, S. B.; MYSKIN, K. Yu. Some Problems of Simultaneous Approximation of Functions of Two Variables and Their Derivatives by Interpolation Bilinear Splines. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 2, p. 147–157, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3583. Acesso em: 6 dec. 2025.