ZAKHARIN, S. F.; PARASYUK, I. O. Generalized and classical almost periodic solutions of Lagrangian systems convex on a compact set. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 12, p. 1601–1608, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4779. Acesso em: 5 dec. 2025.