2015. 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. 12, 1 (Mar. 2015), 204–209. DOI:https://doi.org/10.21123/bsj.2015.12.1.204-209.