Grypeos, M. E., C. G. Koutroulos, and G. J. Papadopoulos. “Approximate Treatment of the Dirac Equation With Scalar and Vector Potentials of Rectangular Shapes”. HNPS Advances in Nuclear Physics 4 (February 19, 2020): 41–50. Accessed May 5, 2024. https://eproceedings.epublishing.ekt.gr/index.php/hnps/article/view/2873.