1. AGR-1. (2002). Lime and fertilizer recommendations 2002–2003. Lexington, KY: University of Kentucky Cooperative Extension Service.
2. AgView. (1999). AgView, version 1.7.14. Springfield, IL: GIS Solutions, Inc.
3. ASAE Standards, (2000). S341.2. Procedure for measuring distribution uniformity and calibrating broadcast spreaders (47th ed.). St. Joseph, MI: ASAE.
4. Babcock, B. A., & Pautsch, G. R. (1998). Moving from uniform to variable-rates on Iowa corn: effects on rates and returns. Journal of Agricultural and Resource Economics, 23, 385–400.
5. Bongiovanni, R., & Lowenberg-DeBoer, J. (2000). Economics of variable-rate lime in Indiana. Precision Agriculture, 2, 55–70.