1. For a full list of glyphosate-resistant weeds, see: http://weedscience.org/Summary/ResistbyActive.aspx.
2. S.B. Richter, US Patent 3,013,054, December 12, 1961.
3. A.H. Widiger, M.L. Aaron, G.F. Dugan, US Patent 2,799,714, July, 16th, 1957.
4. K.R. Payne, M.H. Milnes, US Patent 3,726,929, April 10th, 1973.
5. R. Csikos, US Patent 4,207,261, June 10th, 1980.