GUPTA, P. Index of pseudo-projectively-symmetric semi-Riemannian manifolds. Carpathian Mathematical Publications, [S. l.], v. 7, n. 1, p. 57–65, 2015. DOI: 10.15330/cmp.7.1.57-65. Disponível em: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/1382. Acesso em: 20 apr. 2024.