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Barker, Edward D. and Oliver, B.R. and Maughan, B. (2010) Co-occurring problems of early onset persistent, childhood limited, and adolescent onset conduct problem youth. Journal of Child Psychology and Psychiatry 51 (11), pp. 1217-1226. ISSN 0021-9630.
Ronald, Angelica and Lundstrom, S. and Haworth, C. and Carlström, E. and Gillberg, C. and Mill, J. and Råstam, M. and Hultman, C. and Anckarsäter, H. and Plomin, R. and Lichtenstein, P. and Reichenberg, A. (2010) Trajectories leading to autism spectrum disorders are affected by paternal age: findings from two nationally representative twin studies. Journal of Child Psychology and Psychiatry 51 (7), pp. 850-856. ISSN 0021-9630.