found: DuPont crop protection sulfonylurea herbicides, c2005, via WWW, Mar. 13, 2007:p. 2 (Sulfonylureas are a family of environmentally compatible herbicides that were discovered by DuPont Crop Protection in 1975 and first commercialized for wheat and barley crops in 1982)
found: Compendium of pesticide common names, via WWW, Mar. 13, 2007:Pesticide classification/Herbicides (sulfonylurea herbicides is subclass under urea herbicides and is a see also reference under sulfonamide herbicides)
found: Cheminova A/S Web site, Mar. 13, 2007:herbicides/Accurate (Metsulfuron is one of the leading active ingredients in the sulfonylurea group and a well-known herbicide among farmers around the world)
found: MeSH browser, Mar. 13, 2007(Sulfonylurea Compounds)
