1. W. Skrypnik, "Periodic and bounded solutions of the Coulomb equation of motion of two and three point charges with equilibrium on line," Ukr. Math. Zh., 66, No. 5, 679-693 (2014)
2. English translation: Ukr. Math. J., 66, No. 5, 758-774 (2014).
3. W. Skrypnik, “On exact solutions of Coulomb equation of motion of planar charges,” J. Geom. Phys., 98, 285–291 (2015).
4. W. Skrypnik, “On holomorphic solutions of Hamiltonian equations of motion of point charges,” Ukr. Math. Zh., 63, No. 2, 270–280 (2011); English translation: Ukr. Math. J., 63: 315.
https://doi.org/10.1007/s11253-011-0505-0
5. W. Skrypnik, "On holomorphic solutions of the Darwin equation of motion of point charges," Ukr. Math. Zh., 65, No. 4, 546-564 (2013)