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Posthuma D, Boomsma DI. (2000). A note on the statistical power in extended twin designs. Behav Genet 30, 147-158.

Posthuma D, de Geus EJC, Bleichrodt N, Boomsma DI. (2000). Twin-singleton differences in intelligence? Twin Res, 3:83-87.

Posthuma D, de Geus EJC, Neale MC, Hulshoff Pol HE, Baare WFC, Kahn RS, Boomsma DI. (2000) Multivariate genetic analysis of brain structure in an extended twin design. Behav Genet, 30:311-319.