XIE Qiao-yun, HUANG Wen-jiang, LIANG Dong, PENG Dai-liang, HUANG Lin-sheng, SONG Xiao-yu, ZHANG Dong-yan, YANG Gui-jun. Research on Universality of Least Squares Support Vector Machine Method for Estimating Leaf Area Index of Winter Wheat[J]. Spectroscopy and Spectral Analysis, 2014, 34(2): 489