2Sung R yong Ha, D hong D Jung, Cho Hee Yoon. Arenovated model for spatial analysis of pollutant run off loads in agricultural watershed[J]. Wat. Sci. Tech., 1998, 38(10):207-214.
3Cassel - Gintz M, Petschel - held G. GIS - based assessment of the threat to world forests by patterns of non - sustainable civilization nature interaction[J]. Journal of Environmental Management. 2000, 59:279-298.