Aznabayev, D., Bekbaev, A., Ishmukhamedov, I., Korobov, V. and Turmaganbet, A. (2016) “Nonrelativistic ionization energy levels of a helium atom”, Physical Sciences and Technology, 2(1). Available at: https://phst.kaznu.kz/index.php/journal/article/view/63 (Accessed: 23 November 2024).