渭河上游干旱特征与降水对天水市水资源的影响
朱拥军, 王秀花
The Drought Character in Upper Area of Weihe River and Precipitation Influence on Water Resource in Tianshui
SHU Yong-Jun, WANG Xiu-Hua
J4 . 2003, (4): 50 -54 .