EDITORIALBOARD. On the sixtieth birthday of Dmytro Yakovych Petrina, Corresponding Member of the Ukrainian Academy of Sciences. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 4, p. 316, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5727. Acesso em: 15 dec. 2025.