@article{刘树:45, author = {刘树, 张玲}, title = {我国各省市专利发展有效性的DEA模型分析}, publisher = {统计研究}, year = {2006}, journal = {统计研究}, volume = {23}, number = {8}, eid = {45}, numpages = {3}, pages = {45}, keywords = {专利发展 DEA模型 相对有效性 }, url = {https://tjyj.stats.gov.cn/CN/abstract/article_365.shtml}, doi = {} }