K. C. PETWAL. Newtonian Limit for the Curvature of Space Time. Journal of International Academy of Physical Sciences, [S. l.], v. 23, n. 4, p. 337–347, 2019. Disponível em: https://www.iaps.org.in/journal/index.php/journaliaps/article/view/358. Acesso em: 6 may. 2024.