HAROUN, K. M.; YAGOB, A. A. M.; ABD ALLAH, M. D. Derivation of Klein – Gordon Equation for Frictional Medium. American Scientific Research Journal for Engineering, Technology, and Sciences, [S. l.], v. 38, n. 1, p. 1–6, 2017. Disponível em: https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/3526. Acesso em: 30 apr. 2024.