MARTYNYUK, A. A.; MITROPOLSKIY, Yu. A. Aleksandr Mikhailovich Lyapunov (the 150th anniversary of his birth). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 7, p. 996–1000, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3361. Acesso em: 5 dec. 2025.