Maireche A. A New Approach to the Approximate Analytic Solution of the Three-Dimensional Schrӧdinger Equation for Hydrogenic and Neutral Atoms in the Generalized Hellmann Potential Model. Ukr. J. Phys. [Internet]. 2020 Nov. 12 [cited 2024 Dec. 21];65(11):987. Available from: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019498