Rehman, S., N. sadiq, A. Raheem, and M. Khan. “Theoretical Investigation of Rydberg Energy, Quantum Defect, Radius and Radiative Lifetime of Be III”. Technical Journal, Vol. 28, no. 03, Sept. 2023, pp. 73-80, https://tj.uettaxila.edu.pk/index.php/technical-journal/article/view/1813.