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2. The age of onset of ambivalence in early infancy;Ambrose;J. Child Psychol. Psychiat.,1963
3. Neonatal separation;Barnett;Pediatrics,1970
4. Mothers, mongols, and mores;Beddie;Canad. Med. Assn. J.,1955
5. The origins of reciprocity;Brazelton,1974