M. E. Williams Williams, M. E., Levings, & C. S. (1993). The effect of Rf1 on the methomyl sensitivity of cms-T callus. Maize Genetics Cooperation Newsletter, (67), 98. WILLIAMS, M. E., HEPBURN, A. G., & WIDHOLM, J. M. (1991). SOMACLONAL VARIATION IN A MAIZE INBRED LINE IS NOT ASSOCIATED WITH CHANGES IN THE NUMBER OR LOCATION OF AC-HOMOLOGOUS SEQUENCES. THEORETICAL AND APPLIED GENETICS, 81(2), 272–276. https://doi.org/10.1007/BF00215733