,. In memoriam of Yuri Viktorovich Baryshev. Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, [S. l.], v. 8, n. 4, p. 734–736, 2022. DOI: 10.21638/spbu01.2021.420. Disponível em: https://math-mech-astr-journal.spbu.ru/article/view/13952. Acesso em: 19 may. 2024.