Genetic covariation between brain volumes and IQ, reading performance, and processing speed.
Betjemann RS, Johnson EP, Barnard H, Boada R, Filley CM, Filipek PA, Willcutt EG, DeFries JC, Pennington BF. Genetic covariation between brain volumes and IQ, reading performance, and processing speed. Behav Genet. 2010 Mar; 40(2):135-45.