ISHLINSKY, A. Y.; Mіtrоpolskу Y. A.; Sоkоlоv Y. D.; LAVRIK, V. I. Pavel Feodosyevich Filchakov (on his fiftieth birthday) . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 18, n. 6, p. 97–101, 1966. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8462. Acesso em: 6 dec. 2025.