http://www.iaae-agecon.org/conf/durban_papers/papers/105.pdf
http://agecon.lib.umn.edu/cgi-bin/pdf_view.pl?paperid=14555
http://www.agtrade.org/topics.cfm?topicID=5
http://www.cfnpp.cornell.edu/images/wp22.pdf
https://blog.sciencenet.cn/blog-285749-271383.html
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