A twin study of autism in Denmark, Finland, Iceland, Norway and Sweden.
Steffenburg S; Gillberg C; Hellgren L; Andersson L; Gillberg IC; Jakobsson G; Bohman M; Journal Of Child Psychology And Psychiatry, And Allied Disciplines, 1989, vol. 30, issue 3, p 405, ISSN 00219630. ISBN 00219630.

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