O, L.; S, D. The Excited Helium Photoionization. Scientific transaction of the National University of Mongolia. Physics, [S. l.], v. 3, n. 132, p. 49–67, 2022. DOI: 10.22353/physics.v3i132.264. Disponível em: https://journal.num.edu.mn/physics/article/view/264. Acesso em: 23 nov. 2024.