V. I. Ryazanov, “Solution to the Reich–Walczak conformity problem according to Belynsky–Lavrentyev ”, Ukr. Mat. Zhurn., vol. 44, no. 10, pp. 1406–1411, Oct. 1992, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8239