[ej-凯发k8客户端

[ej-01-7]biotechnology and low-income nations, with an emphasis on china

作者：　　期刊： 　　来源：

作者：huang, jikun, scott rozelle and carl pray　　期刊：journal of agricultural and resource economics, vol 26 no.2 (2001): 555. 　　来源： ccap