A.AL-OBAYDI, M. The Composing of A Gravitational Electromagnetic Tensor and Study it’s Properties. Rafidain Journal of Science, [S. l.], v. 17, n. 2, p. 95–102, 2006. DOI: 10.33899/rjs.2006.43337. Disponível em: https://jamh.uomosul.edu.iq/index.php/rsci/article/view/46913. Acesso em: 29 sep. 2025.