| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Evolution of patent filing activities in the EEC | 978-92-825-1548-8 (92-825-1548-6) | 1980 |
| Evolution of patent filing activities in the USA | 978-92-825-1445-0 (92-825-1445-5) | 1980 |
| Trends in patent filing activities in the EEC: A contribution to the study and assessment of the technological trends in the EEC from 1969 to 1980, based ... analysis of patents | 978-92-825-5320-6 (92-825-5320-5) | 1985 |