1. A. S. Crafts and A. W. Cleary, Hilgardia 10, 401 (1936).
2. T. J. Martin, Pestic. Sci. 20, 289 (1987).
3. H. W. Delvo, Proc. North Cent. Weed Control Conf. 42, 28 (1987).
4. J. M. Green, Weed Technol. 3, 217 (1989).
5. H. M. LeBaron and J. Gressel, Herbicide Resistance in Plants, John Wiley & Sons, New York (1982).