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XU Li-peng, GE Liang-quan, GU Yi, LIU Min, ZHANG Qing-xian, LI Fei, LUO Bin. Research on the Application of Principal Component Analysis and Improved BP Neural Network to the Determination of Fe and Ti Contents in Geological Samples[J]. Spectroscopy and Spectral Analysis, 2013, 33(5): 1392