Hashim Gad Elseed, Mohammed Hashim Albashir, Hajhamed Diab Aljaly, and Naga Abdalaziz. “THE SEPARATION OF VARIABLES METHOD FOR SOLVING THE KLEIN-GORDON EQUATION IN CURVED SPACETIME”. EPRA International Journal of Multidisciplinary Research (IJMR), vol. 9, no. 2, Feb. 2023, pp. 29-35, http://eprajournals.net/index.php/IJMR/article/view/1453.