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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 Sci.J 2015, 12 (1), 204-209. https://doi.org/10.21123/bsj.2015.12.1.204-209.