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2. Pennsylvania infant and family development project III: The origins of individual differences in infant-mother attachment;Belsky;Child Dev.,1984
3. The origins of reciprocity;Brazelton,1974
4. Chon, J. F. & Elmore, M. (in press), Three-month-old infants respond contingently to changes in their mother's affective expression. Infant Behavior and Development.
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