D. L. Nascimento and A. L. A. Fonseca. Finding the Ground State Energy for the Helium Atom in a 2D Configuration by Using the Solutions of a Four-spinor Dirac-like Equation. NFPSR-V3 [Internet]. 2022 Nov. 1 [cited 2026 Jun. 12];:61-80. Available from: https://stm.bookpi.org/NFPSR-V3/article/view/8589