Al-Jibbouri, Hamid. “Variational Calculation of Lithium-Like Ions from B+2 to N+4 Using β-Type Roothaan–Hartree–Fock Wavefunction”. Ukrainian Journal of Physics 66, no. 8 (September 13, 2021): 684. Accessed November 23, 2024. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2020240.