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Antony Cox,
Kate Klein,
Tony Charman,
Gillian Baird,
Simon Baron-Cohen,
John Swettenham,
Auriol Drew
and Sally Wheelwright
(1999).
Autism Spectrum Disorders at 20 and 42 Months of Age: Stability of Clinical and ADI-R Diagnosis. The Journal of Child Psychology and Psychiatry and Allied Disciplines,
40
,
pp 719-732
doi:10.1111/1469-7610.00488