FIGUEIREDO, Giovany M.; MASSA, Eugenio; SANTOS, Jefferson A. Existence of positive solutions for a class of semipositone problems with Kirchhoff operator. Annales Fennici Mathematici, [S. l.], v. 46, n. 2, p. 655–666, 2021. Disponível em: https://afm.journal.fi/article/view/110567. Acesso em: 1 apr. 2026.