C ílin, Constantin. «On Totally Contact Umbilical Submanifolds of a Manifold With a Sasakian 3-Structure». Rev. Téc. Fac. Ing. Univ. Zulia 27, no. 3 (1). Accedido abril 15, 2025. https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/5857.