2Ji Yongfu, Wang Jihe. Thinking and Countermeasures for Eco-Environment Construction of Hexi Region of Gansu Province[A]. ECONOMIC AND ENVIRONMENTAL SUSTAINABLE DEVELOPMENT IN MIDDLE AND WESTERN REGION OF CHINA IN 21st CENTURY[C]. Inner Mongolia People's Publishing House,1999. 114-118.
3Kenneth A. Schmidt. INTERACTIONS BETWEEN FOOD CHEMISTRY AND PREDATION RISK IN FOX SQUIRRELS[J]. Ecology,2000,81(8):2077-2085.
4Antonio M. Mangione M. Denise Dearing, and William H. Karasov. INTERPOPLATION DIFFERENCES IN TOLERANCE TO CREOSOTE BUSH RESIN IN DESERT WOODRATS (NEOTOMA LEPIDA)[J]. Ecology. 2000,81(8):2067-2076.
