Oleksandr Andriyovych Boichuk (on his 65th birthday). Neliniini Kolyvannya, [S. l.], v. 18, n. 2, p. 147–148, 2015. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/776. Acesso em: 21 jan. 2026.