1. G. A. Buchanan, 1974 .Weed survey—southern states., South. Weed Sci. Soc. Res. Rep, 27 :215 –249 .
2. Influence of Tillage Systems on Weed Population Dynamics and Management in Corn and Soybean in the Central USA
3. A simple model relating yield loss to weed density
4. J. D. Doll, 1995 .Hemp dogbane growth and control in corn and soybean., North Cent. Weed Sci. Soc. Proc, 50 :79 –85 .
5. J. D. Doll, 1997 .Hemp dogbane (Apocynum cannabinumL.) management in corn and glyphosate resistant soybeans., Weed Sci. Soc. Am. Abstr, 37 :90 .