Usman, M., M. Shittu, O. Solanke, and S. Onitilo. “ANALYTICAL SOLUTION OF THE RELATIVISTIC KLEIN-GORDON WAVE EQUATION”. LAUTECH Journal of Engineering and Technology, Vol. 13, no. 2, Dec. 2019, pp. 19-29, https://www.laujet.com/index.php/laujet/article/view/337.