1. Anscombe, F.J. and J.W. Tukey. 1963. The examination and analysis of residuals. Technometrics 5: 141–160.
2. Brkic, I., D. Šimić, Z. Zdunic, A. Jambrovic, T. Ledenčan, V. Kovačević, I. Kadar. 2003. Combining abilities of corn-belt inbred lines of maize for mineral content in grain. Maydica, Vol. 48 (in press).
3. Cochran, W.G. and G.M. Cox. 1957. Experimental designs. 2nd Edition. John Wiley & Sons, New York.
4. FAO/UNESCO. 1990. Soil map of the world, revised legend, World Soil Resources Report 60
5. Falconer, D.S. and T.F.C. Mackay. 1996. Introduction to quantitative genetics. 4th edition. Longman Group Ltd. Essex, England.