| title | ISBN-13 (ISBN-10) | year of publica- tion | other author(s) |
|---|---|---|---|
| ICT Investment in the Intangible Economy | 978-92-828-4668-1 (92-828-4668-7) | 1998 | Jorgen Mortensen |
| The Intangible Economy Impact and Policy Issues | 978-92-894-0019-0 (92-894-0019-6) | 2001 | European Communities |