| Titel | ISBN-13 (ISBN-10) | Erschei- nungsjahr |
|---|---|---|
| Local Methods in Nonlinear Differential Equation I/ II | 978-3-540-18926-8 (3-540-18926-2) | 1989 |
| The Restricted 3-Body Problem: Plane Periodic Orbits : Plane Periodic Orbits | 978-3-11-013703-3 (3-11-013703-8) | 1994 |