Internal and External R&D: A Sample Selection Approach
| Year of publication: |
2004
|
|---|---|
| Authors: | Piga, Claudio A. ; Vivarelli, Marco |
| Published in: |
Oxford bulletin of economics and statistics. - Oxford [u.a.] : Wiley-Blackwell, ISSN 0305-9049, ZDB-ID 2151595. - Vol. 66.2004, 4, p. 457-482
|