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Dworzynski, K. and Happé, F. and Bolton, P. and Ronald, Angelica (2009) Relationship between symptom domains in autism spectrum disorders: a population based twin study. Journal of Autism and Developmental Disorders 39 (8), pp. 1197-1210. ISSN 0162-3257.
Senju, Atsushi and Kikuchi, Y. and Akechi, H. and Hasegawa, T. and Tojo, Y. and Osanai, H. (2009) Brief report: does eye contact induce contagious yawning in children with autism spectrum disorder? Journal of Autism and Developmental Disorders 39 (11), pp. 1598-1602. ISSN 0162-3257.