RAGAB, S. F. NEW ANALYSIS OF WITTAKER FUNCTIONS. Tamkang Journal of Mathematics, [S. l.], v. 21, n. 4, p. 303–326, 1990. DOI: 10.5556/j.tkjm.21.1990.4675. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4675. Acesso em: 26 apr. 2024.