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Spinath, F.M. and Harlaar, N. and Ronald, Angelica and Plomin, R. (2004) Substantial genetic influence on mild mental impairment in early childhood. American Journal of Mental Retardation 109 (1), pp. 34-43. ISSN 0895-8017.
Spinath, F.M. and Ronald, Angelica and Harlaar, N. and Price, T.S. and Plomin, R. (2003) Phenotypic g early in life: on the etiology of general cognitive ability in a large population sample of twin children aged 2–4 years. Intelligence 31 (2), pp. 195-210. ISSN 0160-2896.
Ronald, Angelica and Spinath, F.M. and Plomin, R. (2002) The aetiology of high cognitive ability in early childhood. High Ability Studies 13 (2), pp. 103-114. ISSN 1359-8139.