Selman, Ahmed Abdul-Razzaq. “Particle-Hole State Density Calculations With Non-Equidistant Spacing Model: II. Pairing and Exact Treatment”. Iraqi Journal of Physics 9, no. 16 (December 1, 2011): 6–12. Accessed May 3, 2025. https://www.ijp.uobaghdad.edu.iq/index.php/physics/article/view/780.