M. S. Shabozov, “On the error of the interpolation by bilinear splines”, Ukr. Mat. Zhurn., vol. 46, no. 11, pp. 1554–1560, Nov. 1994, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5594