RAZZAGHI, Mohsen; MARZBAN, Hamid-Reza. Hybrid Functions in the Calculus of Variations. CUBO, A Mathematical Journal, [S. l.], v. 4, n. 1, p. 293–313, 2002. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1735. Acesso em: 3 nov. 2025.