SkrypnikW. I. “Mechanical Systems With Singular Equilibria and the Coulomb dynamics of Three Charges”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 4 (April 25, 2018): 519-533. Accessed December 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1573.