“Studying the X- Ray Atomic Scattering Form Factor and Nuclear Magnetic Shielding Constant for Be Atom in Its Excited State (1s2 2s 3s) and the Be - Like Ions”. Baghdad Science Journal, vol. 12, no. 1, Mar. 2015, pp. 204-9, https://doi.org/10.21123/bsj.2015.12.1.204-209.