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Petrill, Stephen A.; Logan, J.; Vincent, P.S.; Hart, S.A.; Thompson, L.; Kovas, Yulia and Plomin, R.. 2012. Math Fluency is Etiologically Distinct from Untimed Math Performance, Decoding Fluency, and Untimed Reading Performance: Evidence from a Twin Study. Journal of Learning Disabilities, 45(4), pp. 371-381. ISSN 0022-2194 [Article]

Petrill, S.; Kovas, Yulia; Hart, S.; Thompson, L. and Plomin, R.. 2009. The Genetic and Environmental Etiology of High Math Performance in 10-Year-Old Twins. Behavior Genetics, 39(4), pp. 371-379. ISSN 0001-8244 [Article]