El-Sabaa F.M., Hosny M., Zakria S.K., “Bifurcations of Liouville Tori of Generalized Two-Fixed Center Problem”, Ital. J. Pure Appl. Math., 2020, no. 43, 331–352
Malkov E.A., Bekov A.A., Momynov S.B., Beckmuhamedov I.B., Kurmangaliyev D.M., Mukametzhan A.M., Orynqul I.S., “Investigation of Two Fixed Centers Problem and Henon-Heiles Potential Based on the Poincare Section”, News Natl. Acad. Sci. Rep. Kazakhstan-Ser. Phys.-Math., 1:329 (2020), 55–61
El-Sabaa F.M., Hosny M., Zakria S.K., “Bifurcations of Armbruster Guckenheimer Kim Galactic Potential”, Astrophys. Space Sci., 364:2 (2019), 34
El-Sabaa F.M. Hosny M. Zakria S.K., “Bifurcations of Liouville Tori of a Two Fixed Center Problem”, Astrophys. Space Sci., 363:4 (2018), 77
Kim S., “Homoclinic Orbits in the Euler Problem of Two Fixed Centers”, J. Geom. Phys., 132 (2018), 55–63
Miguel A. Gonzalez Leon, Juan Mateos Guilarte, Marina de la Torre Mayado, “Orbits in the Problem of Two Fixed Centers on the Sphere”, Regul. Chaotic Dyn., 22:5 (2017), 520–542
Alexey V. Borisov, Ivan S. Mamaev, Ivan A. Bizyaev, “The Spatial Problem of 2 Bodies on a Sphere. Reduction and Stochasticity”, Regul. Chaotic Dyn., 21:5 (2016), 556–580
Vozmishcheva T., “The limit passage of space curvature in problems of celestial mechanics with the generalized Kepler and Hooke potentials”, Astrophys. Space Sci., 361:9 (2016), 282
Jiménez-Lara L., Llibre J., Vargas M., “Global phase portraits of the planar perpendicular problem of two fixed centers”, J. Math. Phys., 50:4 (2009), 042903, 10 pp.
Borisov A.V., Mamaev I.S., “Relations between integrable systems in plane and curved spaces”, Celestial Mech. Dynam. Astronom., 99:4 (2007), 253–260