Moshinsk, M., A. Del Sol Mesa, ., and Y. Smirnov. “Symmetry Lie Algebra of the Two Body System With a Dirac Oscillator Interaction”. Revista Mexicana De Física, vol. 41, no. 3, Jan. 1994, pp. 322-41, https://rmf.smf.mx/ojs/index.php/rmf/article/view/2495.