MITROPOLSKIY, Yu. A. Mark Grigor’evich Krein. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 1-2, p. 3–4, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5765. Acesso em: 6 dec. 2025.