共 50 条
- [4] Prepaid monetary incentives and mail survey response rates AMERICAN STATISTICAL ASSOCIATION - 1996 PROCEEDINGS OF THE SECTION ON GOVERNMENT STATISTICS, 1996, : 206 - 209
- [9] A cost-benefit analysis of R&D tax incentives CANADIAN JOURNAL OF ECONOMICS-REVUE CANADIENNE D ECONOMIQUE, 2004, 37 (02): : 313 - 335