@Article{2018112, title = {京津冀地区农产品集聚及时空演变特征}, author = {郑士伟,杨飞,黄敏}, journal = {中国农业资源与区划}, volume = {39}, number = {12}, pages = {112}, numpages = {9.0000}, year = {2018}, month = {}, doi = {}, publisher = {《中国农业资源与区划》编辑部} }