Using Gaussian Basis-Sets with Gaussian Nuclear Charge Distribution to Solve Dirac-Hartree-Fock Equation for 83Bi-Atom. ANJS [Internet]. 2018 May 24 [cited 2024 Nov. 22];19(3):70-6. Available from: https://mail.anjs.edu.iq/index.php/anjs/article/view/207