PETER J BUSSEY. Improving our Understanding of the Klein-Gordon Equation. Global Journal of Science Frontier Research, [S. l.], v. 22, n. A7, p. 11–19, 2022. Disponível em: https://journalofscience.org/index.php/GJSFR/article/view/102564. Acesso em: 17 may. 2024.