1.【作者(必填)】
Eric C. Wanga, , , Weichiao Huangb
【文题(必填)】
Relative efficiency of R&D activities: A cross-country study accounting for environmental factors in the DEA approach
【年份(必填)】
Research Policy

Volume 36, Issue 2, March 2007, Pages 260–273
【全文链接或数据库名称(选填)】http://www.sciencedirect.com/science/article/pii/S0048733306002149

2.【作者(必填)】
Anming Zhanga, , , Yimin Zhangb, , Ronald Zhaoc,
【文题(必填)】
Astudy of the R&D efficiency and productivity of Chinese firms
【年份(必填)】

Journal of Comparative Economics


Volume 31, Issue 3, September 2003, Pages 444–464

【全文链接或数据库名称(选填)】http://www.sciencedirect.com/science/article/pii/S0147596703000556