1- Blackith, R.E., and Mce Kevan, D.K. 1967. A study of the genus chrotogonus (Orthoptera). VIII. A study of variation in external morphology. Evolution 21: 76-84.
2- Bretting, P.K., Goodman, M.M., and Studer, C.W. 1990. Isozymatic variation in Guatemalan races of maize. American Journal of Botany 77: 211-225.
3- Camussi, A. 1979. Numerical taxonomy of Italian population of maize based on quantitative traits. Maydica 24: 161-174.
4- Choukan, R. 2006. Heterotic classification of corn line based on SCA with tester lines. Journal of Seed and Plant 22: 399-409. (In Persian with English Summary)
5- Choukan, R., Hosseinzade, E., Ghanadha, M.R., Talei, E., and Mohammadi, S.A. 2005. Corn lines clustering based on morphological traits. Journal of Seed and Plant 22: 399-409. (In Persian with English Summary)
6- Crossa, J., Basford, K., Taba, S., De Lacy, I., and Silva, E. 1995. Three mode analysis of maize using morphological and agronomic attributes measured in multilocation trials. Crop Science 35 1483-1491.
7- Doebley, J.I., Goodman, M.M. and Studer, C.W. 1985. Isozymatic variation in races of maize from Mexico. American Journal of Botany 72: 629-639.
8- Galarreta, J. I. R., and Alvarez, A. 2001. Morphological classification of maize landraces from Northern Spain. Gen. Resources and Crop Evolution 48: 391-400.
9- Goodman, M.M., and Paterniani, E. 1969. The races of maize. III. Choices of appropriate characters for racial classification. Economic Botany 23: 265-273.
10- Gouesnard, B., Dallard, Panouille, A. and Boyat, A. 1997. Classification of French maize populations based on morphological traits. Agronomic 17: 491-498.
11- Hallauer, A.R. and Miranda, J.B. 1988. Quantitative Genetics in Maize Breeding. 2nd ed. Iowa State University Press, Ames., Iowa.
12- Han, G.C., Vasal, S.K., Beck, D.L. and Elis, E. 1991. Combining ability of inbred lines derived from CIMMYT maize (Zea mays L.) germplasm. Maydica 36: 57-64.
13- Hussaini, S.H., Goodman, M.M., and Timoty, D.H. 1977. Multivariate analysis and the geographical distribution of the world collection of finger millet. Crop Science 17: 257-263.
14- Karimizade, R., Dehghani, H., and Dehghanpour, Z. 2006. Determination of corn hybrids stability by cluster analysis. Jornal of Agriculture and Natural Resources Science and Technology Iran 3(B): 337-347. (In Persian with English Summary)
15- Moghaddam, M., Mohammadi Shoti, M., and Aghaie Sarborzeh, M. 1995. Miultivariate Statistical Methods, A Primer. Pishtaz Elm publication. Tabriz, Iran. pp: 25-50. (In Persian)
16- Llaurado M., and Moreno-Gonzalez, J. 1993. Classification of northern Spanisn populations of maize by methods of numerical taxonomy. I. Morphological traits. Maydica 38: 15-21.
17- Sanchez, J.J., and Goodman, M. M. 1992. Relationships among Mexican and some north American and south American races of maize. Maydica 37: 41-51.
18- Smith, J.S.C., and Smith, O.S. 1989. The description and assessment of distance between inbred lines of maize: I. The use morphological traits as descriptors. Maydica 34: 141-150.
19- Smith, J.S.C., and Smith, O.S. 1992. Measurement of genetic diversity among maize hybrids: a comparison of isozymic, RFLP, pedigree, and heterosis data. Maydica 37: 53-60.