Bristol M M, Cohen D J, Costello E J, Denckla M, Eckberg T J, Kallen R, Kraemer H C, Lord C, Maurer R, McIlvane W J, Minshew N, Sigman M, Spence M A
University of North Carolina at Chapel Hill School of Medicine, USA.
J Autism Dev Disord. 1996 Apr;26(2):121-54. doi: 10.1007/BF02172002.