7[1] Earl R, Wheeler P N, Blackmore B S，et al．Precision Farming - The Management of Variability Landwards．The Journal of the Institution of Agricultural Engineers，1996，51（4）:18～23．(also available in Korean)
8[2] Blackmore B S. Precision Farming; An Introduction Outlook on Agriculture.CABI，1994，23（4）:275～280．
9[3] Larscheid G，Blackmore B S. Interactions between Farm Managers and Information Systems with Respect to Yield Mapping in 3rd International Conf. on Precision Agriculture, Edited by Robert, Rust and Larson. (ASA, CSSA, SSSA, Madison, WI. 1996), p.1153.
