| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Differential Topology: Proceedings of the Second Topology Symposium, Held in Siegen, Frg, Jul. 27-Aug. 1, 1987 | 978-0-387-50369-1 (0-387-50369-2) | 1988 |
| Vector fields and other vector bundle morphisms: A singularity approach | 978-0-387-10572-7 (0-387-10572-7) | 1981 |