O. Litvin, “Interlination of the functions of 2 variables on $M (M\geq2)$ straight lines with the highest algebraic accuracy ”, Ukr. Mat. Zhurn., vol. 44, no. 11, pp. 1498–1504, Nov. 1992, Accessed: Dec. 15, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8251