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Combination Models of “Ton Grain Yielding Field” in Chongqing Area and Tkeir Benefit Analysis
ZhengQinyu, Zhu Zhijun, Hu Shengrong, Yuan Ke, Lei Yan, Li Dengguo, Cheng Shiyu, Wen Yongxue, Liu Guantang
cje . 1993, (2): 34 -36 .