Khurshid, Ayesha, and Zia Khan. “Calculate the Ground State Energy of Hydro Helium Cation (2+) (He++H)”. American Scientific Research Journal for Engineering, Technology, and Sciences 87, no. 1 (April 2, 2022): 32–38. Accessed May 8, 2024. https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/7553.