SINHA, K. P.; SRIVASTAVA, S. K. Some Consequences of Dual Nature of Ricci Scalar in the Early Universe. The Journal of the Indian Mathematical Society, [S. l.], v. 61, n. 1-2, p. 80–86, 1995. Disponível em: https://informaticsjournals.co.in/index.php/jims/article/view/21867. Acesso em: 8 nov. 2024.