Kepler’s problem of a two-body system perturbed by a third body A. S. Abdel-Rahman, Youssef A. Sabry and E. M. Ahmed Eur. Phys. J. Plus, 139 10 (2024) 895 Published online: 15 October 2024 DOI: 10.1140/epjp/s13360-024-05659-1