A.Al-Obaydi, Muayad, and مؤيد. “The Composing of A Gravitational Electromagnetic Tensor and Study it’s Properties”. Rafidain Journal of Science 17, no. 2 (June 24, 2025): 95–102. Accessed August 16, 2025. https://ojs.uomosul.edu.iq/index.php/rsci/article/view/12259.