Shengmei Yang Qiuwen Zhang Wenbo Li Automated Estimation of Vegetation Fraction Based on Landsat TM/ETM+ Imagery. 891-894 2008 CSSE (1) http://dx.doi.org/10.1109/CSSE.2008.1337 conf/csse/2008-1 db/conf/csse/csse2008-1.html#YangZL08