4WEI Ya-li 1,HUI Wei 2,WANG Li-guo 3(1 College of Resources and Environment,Sichuan Agricultural University,Yaan,Sichuan 625014,2Agronomy College,Sichuan Agricultural University,Yaan,Sichuan 625014,3college of land environment science,Jiangxi Agricultural University,Nanchang,Jiangxi 330045).A Correlation Analysis of Tourism Based on Gray Theory——A case of Xingwen County[J].四川地质学报,2009,29(S1):133-139.
