,. On the 80th anniversary of Leon Aganesovich Petrosyan. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, [S. l.], v. 8, n. 2, p. 370–372, 2021. Disponível em: https://math-mech-astr-journal.spbu.ru/article/view/11484. Acesso em: 18 may. 2024.