Skrypnik, W. I. “Two-Dimensional Coulomb Dynamics of Two and Three Equal Negative Charges in the field of Two Equal Fixed Positive Charges”. Ukrains’kyi Matematychnyi Zhurnal 68, no. 11 (November 25, 2016): 1528-1539. Accessed September 26, 2022. http://umj.imath.kiev.ua/index.php/umj/article/view/1939.