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试验优化设计与统计分析[M]. 科学出版社 , 李志西, 2010
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Development of a site-specific application system for liquid animal manures. Morris, D.K.,Ess, D.R.,Hawkins, S.E.,Parsons, S.D. Applied Engineering in Agriculture . 1999
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Variable-rate, digitally controlled metering device. Camp, C.R.,Sadler, E.J.,Evans, D.E.,Usrey, L.J. Applied Engineering in Agriculture . 2000