CHAUBEY, S. K.; YILDIZ, A. On Ricci tensor in the generalized Sasakian-space-forms. International Journal of Maps in Mathematics, [S. l.], v. 2, n. 1, p. 131–147, 2019. Disponível em: https://journalmim.com/index.php/journalMIM/article/view/54. Acesso em: 2 may. 2024.