Hasan, A. K., F. H. Obeed, and A. N. Rahim. “Positive Parity Levels of 21,23Na Isotopes by Using the Nuclear Shell”. Ukrainian Journal of Physics 65, no. 1 (February 3, 2020): 3. Accessed April 25, 2024. https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019340.