6Thakur M,Hurburgh C R.Framework for Implementing Traceability System in the Bulk Grain Supply Chain[J] .Journal of Food Engineering,2009,95 (4):617-626.
7Beghin J C,Bureau J C,Park S J.Food Security and Agricultural Protection in South Korea[J] .American Journal of Agricultural Economics,2003,85 (3):8-15.
8Viscencio-Brambila H,Fuller S W.Estimated effect of deepened US Gulf ports on export-grain flow patterns and logistics costs[J] .Logistics and Transportation Review,1987,23(2):139-145.
9Boehlje M.The microdynamics of structural changes in agriculture:discussion[J] .American Journal of Agricultural Economics,1984,66 (5):846-847.
