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8. Case Analysis of Farm Agriculture Machinery Informatization Management Network System. By Hui Yang, Xi Wang, and Weidong Zhuang, IFIP Advances in Information and Communication Technology, Vol. 317, 2010, pp. 65-76.
9. Iowa State University: www.extension.iastate.edu/agdm/cdmachinery.html.
10. Kansas State University: www.agmanager.info.