IVANOV, B. . On the 80th Anniversary of Alexander Semenovich Kovalev. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, Харків, Україна, v. 51, n. 6, p. 731–732, 2025. Disponível em: http://80.92.230.95/index.php/fnt/article/view/9477. Acesso em: 10 лис. 2025.