ROMANYUK, A. S.; SAMOILENKO, A. M. Bogolyubov Readings-2008. International Conference "Differential Equations, Theory of Functions and Applications" (on the occasion of the 70th anniversary of academician AM Samoilenko). Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 12, p. 1722, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3285. Acesso em: 5 dec. 2025.