YANKOVSKAYA, G. 100th anniversary of Lev Efimovich Kertman. PERM UNIVERSITY HERALD. History, [S. l.], v. 38, n. 3, p. 5–6, 2019. Disponível em: https://press.psu.ru/index.php/history/article/view/2689. Acesso em: 3 jul. 2024.