$ $. Vasylyshyn Bogdan Vasyliovych (obituary). Carpathian Mathematical Publications, [S. l.], v. 4, n. 1, p. 160–161, 2012. Disponível em: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/3059. Acesso em: 29 apr. 2024.