8Organization for Economic Co-operation and Develop- ment, Food and Agriculture Organization of the United Nations. OECD-FAO Agricultural Outlook 2007 [M]. OECD Publishing, 2007.
9Benavides G., Price volatility forecasts for agricuhural commodities: an application of historical volatility models, op- tion implied and composite approaches for futures prices of corn and wheat[R].Central Bank of Mexico,2004:52-65.
10Trostle R.,Global Agricultural Supply and Demand: Fac- tors Contributing to the Recent Increase in Food Commodity Prices[R].USDA,2008 : 76-85.