Malkov, E.A., Bekov, A.A., Momynov, S.B., Beckmuhamedov, I.B., Kurmangaliyev, D.M., Mukametzhan, A.M., AND Orynqul, I.S.. " Poincare sections for two fixed centers problem and Henon-Heiles potential" Recent Contributions to Physics (Rec.Contr.Phys.) [Online], Volume 72 Number 1 (26 March 2020)