Nascimento , D. L., and A. L. A. Fonseca. “On a 2D Version of Dirac’s Equation for One- and Two- Electron Atoms and Their Analytical and Numerical Solutions”. Current Perspective to Physical Science Research Vol. 2 (September 29, 2023): 24–44. Accessed June 4, 2026. https://stm.bookpi.org/CPPSR-V2/article/view/12048.