The effect of fertilizer usage on grain output and environmental cost: an empirical study in Hunan province
ZHAO Zhijian, HU Xiaojuan, PENG Cuiting, YAO Junrong
Ecology and Environment . 2012, (12): 2007 -2012 .  DOI: 10.16258/j.cnki.1674-5906(2012)12-2007-06

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