Boichuk О. A. et al. Mykola Oleksiiovych Perestyuk (on his 70th birthday). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 68, n. 1, p. 142–144, 2016. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1828. Acesso em: 5 dec. 2025.