求Heifner文献二篇(关于套期保值),Google不到原文,向坛子里各位求助。急急急!!!
(1)Heifner, R. G. Hedging Potential in Grain Storage and Livestock Feeding. Washington DC: U.S. Department of AgricultureA gr. Econ. Rep. No. 238, 1973.
(2) Heifner, R. G. "Optimal Hedging Levels and Hedging Effectiveness in Cattle Feeding." Agr. Econ. Res. 24(1972):25-36.


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