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2. Distress and Comfort;Dunn,1977
3. A study of six cases of de Lange Amsterdam Dwarf syndrome: with special attention to voice, speech and language characteristics;Fraser;Dev. Med. Child Neurol.,1978
4. Fraser W. and Ozols D. (1980) Cries of pain and distress in the severely mentally handicapped. In: Mittler P. (ed.) Proceedings of the 5th Congress of the International Association for the Scientific Study of Mental Deficiency. Jerusalem. (In press.)
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