1. T. A. Bauer, and D. A. Mortensen .1992 .A comparison of economic optimum thresholds for two annual weeds in soybeans., Weed Technol, 6 :228 –235 .
2. A. C. Bennett, A. J. Price, M. C. Sturgill, G. S. Buol, and G. G. Wilkerson .2003 .HADSS™, Pocket HERB™, and WebHADSS™: decision aids for field crops., Weed Technol, 17 :412 –420 .
3. H. D. Coble, and D. A. Mortensen .1992 .The threshold concept and its application to weed science., Weed Technol, 6 :191 –195 .
4. R. Cousens, 1987 .Theory and reality of weed control thresholds., Plant Prot. Q, 2 :13 –20 .
5. G. F. Czapar, M. P. Curry, and L. M. Wax .1997 .Grower acceptance of economic thresholds for weed management in Illinois., Weed Technol, 11 :828 –831 .