TRETYNYK, V. V. Hidden symmetries of the two-particle dirac equation with linear interaction. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 9, p. 1295–1296, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5244. Acesso em: 17 apr. 2025.