1. Bock, R. D., and Vandenberg, S. G. (1968). Components of heritable variation in mental test scores. In Vandenberg, S. G. (ed.),Progress in Human Behavior Genetics, Johns Hopkins University Press, Baltimore, pp. 233?260.
2. CERN (1977).MINUIT: A System for Function Minimization and Analysis of Parameter Errors and Correlations, CERN, Geneva, Switzerland.
3. DeFries, J. C., and Fulker, D. W. (1986). Multivariate behavioral genetics and development.Behav. Genet. 16:1?10.
4. DeFries, J. C., Johnson, R. C., Kuse, A. R., McClearn, G. E., Polovina, J., Vandenberg, S. G., and Wilson, J. R. (1979). Familial resemblance for specific cognitive abilities.Behav. Genet. 9:23?43.
5. DeFries, J. C., Plomin, R., Vandenberg, S. G., and Kuse, A. R. (1981). Parent-offspring resemblance for cognitive abilities in the Colorado Adoption Project: Biological, adoptive, and control parents and one-year-old children.Intelligence 5:245?277.