Generalized periodic orbits in some restricted three-body problems Ortega Ríos, Rafael Zhao, Lei Forced Kepler problem Restricted three-body problem Generalized periodic orbits Kustaanheimo–Stiefel Regularization We treat the circular and elliptic restricted three-body problems in inertial frames as periodically forced Kepler problems with additional singularities and explain that in this setting the main result of Boscaggin et al. (Trans Am Math Soc 372: 677–703, 2019) is applicable. This guarantees the existence of an arbitrary large number of generalized periodic orbits (periodic orbits with possible double collisions regularized) provided the mass ratio of the primaries is small enough. 2025-01-16T10:22:25Z 2025-01-16T10:22:25Z 2021 journal article https://doi.org/10.1007/s00033-021-01470-5 https://hdl.handle.net/10481/99364 https://doi.org/10.1007/s00033-021-01470-5 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Springer