1. American Society of Agricultural Engineers Publication;R.A. Barenescu,1982
2. American Society of Agricultural Engineers Publication;C.E. Goering,1982
3. Peterson, C.L., G.L. Wagner and D.L. Auld, Paper No. 81-3578 presented at the 1981 Winter Meeting of the American Society of Agricultural Engineers, Chicago, IL, ASAE, St. Joseph, MI, 1981.
4. American Society of Agricultural Engineers Publication;K.S. Varde,1982
5. Northern Agricultural Energy Center Notes for September, 1982, NAEC/NRRC, USDA, Peoria, IL, 1982.