EditorialBoard. On the sixtieth birthday of Dmytro Yakovych Petrina, Corresponding Member of the Ukrainian Academy of Sciences. Ukr. Mat. Zhurn. [Internet]. 1994 Apr. 25 [cited 2025 Dec. 15];46(4):316. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/5727