1. Abou-El-Fittouh, H. A., J. O. Rawlings, and P. A. Miller. 1969. Classification of environments to control genotype by environment interactions with an application to cotton. Crop Science9: 135–140.
2. Brieger, F. G., J. T. A. Gurgel, E. Paterniani, A. Blumenschein, and M. R. Alleoni. 1958. Races of maize in Brazil and other eastern South American countries. National Academy of Sciences-National Research Council Publ. 593. Washington, D. C. 283 p.
3. Brown, W. L. 1960. Races of maize in the West Indies. National Academy of Sciences-National Research Council Publ. 792. Washington, D. C. 60 p.
4. Comstock, R. E., and R. H. Moll. 1963. Genotype-environment interactions. Pp. 164–196in W. D. Hanson and H. F. Robinson (eds.), Statistical genetics and plant breeding. National Academy of Sciences-National Research Council Publ. 982.Washington, D. C. 614 p.
5. Edwards, R. J. 1966. Comparisons of methods and procedures for intraspecific classification ofZea mays L. Ph.D. thesis, University of Illinois, Urbana. 100 P.