Skrypnik W. Periodic Coulomb dynamics of three equal negative charges in the field of six equal positive charges fixed in octahedron vertices. Ukr. Mat. Zhurn. [Internet]. 2023Mar.2 [cited 2024Apr.25];75(2):230 -246. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/7263