共 50 条
- [1] R&D, product innovation, and exporting: evidence from UK new technology based firms OXFORD ECONOMIC PAPERS-NEW SERIES, 2011, 63 (02): : 279 - 306
- [9] Did R&D Firms Used to Patent? Evidence from the First Innovation Surveys JOURNAL OF ECONOMIC HISTORY, 2011, 71 (04): : 1032 - 1059