1. Allen R G, Pereira L S, Raes D et al., 1998. Crop evapotranspiration guidelines for computing crop water requirements. FAO Irrigation and Drainage Paper 56. FAO.
2. Barry R G, 1992. Mountain Weather and Climate. London: Methuen.
3. Bian Duo, Du Jun, 2006. Climate variation feature and its effect on environment change in Central Tibet from 1961–2000. Journal of Applied Meteorological Science, 17(2): 169–175. (in Chinese)
4. Chen B, Chao W C, Liu X, 2003. Enhanced climatic warming in the Tibetan Plateau due to doubling CO2: A model study. Climate Dynamics, 20(4): 401–413.
5. Chen Shengbin, Liu Yunfeng, Axel Thomas, 2006. Climatic change on the Tibetan Plateau: Potential evapotran-spiration trends from 1961–2000. Climatic Change, 76: 291–319.