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Bu, H., L. K. Sharma, A. Denton, and D. W. Franzen. (2017): Comparison of Satellite Imagery and Ground-Based Active Optical Sensors as Yield Predictors in Sugar Beet, Spring Wheat, Corn, and Sunflower. Agron. J. 109 299-308. doi:10.2134/agronj2016.03.0150