DR. C. Y. LO. Some Mathematical and Physical Errors of Wald on General Relativity. Global Journal of Science Frontier Research, [S. l.], v. 13, n. A2, p. 1–9, 2013. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/744. Acesso em: 7 may. 2024.