Mitropolsky YA, Shevelo VN. Nikolai Ivanovich Muskhelishvili (on his 80th birthday). Ukr. Mat. Zhurn. [Internet]. 1970 Dec. 25 [cited 2025 Dec. 6];23(1):49-51. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8478