Díaz-Cano Ocaña, AntonioGonzalez Gascón, F.2023-06-202023-06-2020060375-960110.1016/j.physleta.2006.05.027https://hdl.handle.net/20.500.14352/49878It is shown that for particles moving in a plane under the action of attracting central potentials and a perturbing force (potential but not central),orbits representing the falling down of the particle to the center of force exist.engjournal articlehttp://www.sciencedirect.com/science/article/pii/S0375960106007171http://www.sciencedirect.com/restricted access530.1Collision orbitsPerturbation of central potentialsFísica matemática