1. Bickford, C. A. (1952). The sampling design used in the forest survey of the northeast. Journal of Forestry, 50(4), 290–293.
2. Bickford, C. A., Mayer, C. E., & Ware, K. D. (1963). An efficient sampling design for forest inventory: The northeastern forest resurvey. Journal of Forestry, 61(11), 826–833.
3. Cai, F. Y., Halik, U., Arkin, A., Abdumijit, A., Coenradie, B., & Kleinschmit, B. (2008). Tree height distribution and density of Populus euphratica forest along the Argan section in the lower reaches of Tarim River. Ecology and Environment, 17(3), 1086–1090.
4. Chinese Committee for Implementing UN Convention to Combat Desertification (CCICCD) (1997). China country paper to combat desertification. Beijing: China Forestry Publishing House.
5. Chen, Y. N., Zilliacus, H., Li, W. H., Zhang, H. F., & Chen, Y. P. (2006). Ground-water level affects plant species diversity along the lower reaches of the Tarim river, Western China. Journal of Arid Environments, 66(2), 231–246.