6Williams P G, Smith M W. The Frozen Earth. Cambridge: Cambridge University Press, 1989. 59-82.
7Camill P, Clark G S. Climate change disequilibrium of boreal permafrost peatlands caused by local processes. American Naturalist, 1998, 15(3): 207-222.
8Cheng G D, Dramis F. Distribution of mountain permafrost and climate. Permafrost and Periglacial Processes, 1992, 3(2):83--91.
9Gorbunov A P. Permafrost in the mountains of Central Asia. In: Proceedings, Third International Conference on Permafrost,Vol. 1. Ottawa:National Research Council of Canada, 1978. 372-377.
10King L. Zonation and ecology of high mountain permafrost in Scandinavia. Geografiska Annaler, 1986, 68A(3): 131-139.
