AZNABAYEV, D.; BEKBAEV, A.; ISHMUKHAMEDOV, I.; KOROBOV, V.; TURMAGANBET, A. Nonrelativistic ionization energy levels of a helium atom. Physical Sciences and Technology, [S. l.], v. 2, n. 1, 2016. Disponível em: https://phst.kaznu.kz/index.php/journal/article/view/63. Acesso em: 3 jul. 2024.