LitvinO.N. “Interlination of the Functions of 2 Variables on $M (M\geq2)$ Straight Lines With the Highest Algebraic Accuracy ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 11 (November 6, 1992): 1498-1504. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8251.