Parasyuk О. S. and N. O. . Virchenko, “Briefly about scientific heritage of M. Kravchuk, Member of the Academy of Sciences of Ukraine”, Ukr. Mat. Zhurn., vol. 44, no. 7, pp. 860–879, Aug. 1992, Accessed: Dec. 15, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8119