References
- Hertel , T. W. , Eldon Ball , V. , Huang , K. S. and Tsigas , M. E. Computing Farm Level General Equilibrium Demand Elasticities for Agricultural Commodities , RB-988 W. Lafayette, IN : Purdue University Agricultural Experiment Station .
- Hertel , T. W. , Stiegert , K. W. and Vroomen , H. 1996 . Nitrogen-land substitution corn production: a reconciliation of aggregate and firm level data . American Journal of Agricultural Economics , 78 : 30 – 40 .