RT Journal Article T1 Collision orbits in the presence of perturbations. A1 Díaz-Cano Ocaña, Antonio A1 Gonzalez Gascón, F. AB It 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. PB Elsevier SN 0375-9601 YR 2006 FD 2006 LK https://hdl.handle.net/20.500.14352/49878 UL https://hdl.handle.net/20.500.14352/49878 LA eng DS Docta Complutense RD 6 abr 2025