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Sensitive electrochemical immunosensor for α-fetoprotein based on graphene/SnO2/Au nanocompositeLiu, Junfeng; Lin, Guanhua; Xiao, Can; Xue, Ying; Yang, Ankang; Ren, Hongxuan; Lu, Wensheng; Zhao, Hong; Li, Xiangjun; Yuan, Zhuobin · Biosensors and Bioelectronics · 2015