YADAV, R. B. On Some Categories of Riemannian Manifolds. The Journal of the Indian Mathematical Society, [S. l.], v. 86, n. 1-2, p. 199–210, 2018. DOI: 10.18311/jims/2019/22525. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/22525. Acesso em: 3 may. 2024.