EditorialBoard. “Jubilees Mykola I. Shkil’ (on His 60th Birthday)”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 2 (February 25, 1993): 303–304. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5813.