NIKITIN, A. Wilhelm Fushchych (18.12.1936–07.04.1997). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 3, p. 291–293, 2022. DOI: 10.37863/umzh.v74i3.7192. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7192. Acesso em: 5 dec. 2025.