DE, K.; DE, U. C. .; VELIMIROVIC, L. S. . Some curvature properties of perfect fluid spacetimes. Quaestiones Mathematicae, [S. l.], v. 47, n. 4, p. 751–764, 2024. DOI: 10.2989/16073606.2023.2255933. Disponível em: https://www.ajol.info/index.php/qm/article/view/272233. Acesso em: 8 oct. 2026.