Mahmood, M.A., Adil, B.H. and Al Bayati, K.H. (2013) “33Application of Gaussian Wave Functions for 1s States in Helium and Helium Like Atoms”, Al-Nahrain Journal of Science, 16(3), pp. 98–103. Available at: https://mail.anjs.edu.iq/index.php/anjs/article/view/586 (Accessed: 22 May 2026).