,. On the international scientific conference on mechanics “The Ninth Polyakhov Readings”. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, [S. l.], v. 8, n. 4, p. 728–731, 2022. DOI: 10.21638/spbu01.2021.418. Disponível em: https://math-mech-astr-journal.spbu.ru/article/view/13950. Acesso em: 19 may. 2024.