7BOOTH G G, BROKMAN P,TSE Y. The relationship between U. S. and Canadian wheat futures[J]. Applied Finance Journal, 1998,8 (1) :73-80.
8JIAN Y,JIN ZH,DAVIN J L. Price and volatility transmission in international wheat futures markets [J]. Annals of Economics and Finance, 2003 (4) : 37-50.