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2. Measurement of infant difficulties;Bates;Child Dev.,1979
3. Preterm infant interaction with the caregiver in the first year of life and competence at age two;Beckwith;Child Dev.,1979
4. Beebe, B., Kronen, J. and Gerstman, L. (1983), Simultaneous directional tracking in mother-infant play. Paper presented at the Society for Research in Child Development, Detroit, Michigan.
5. Temperament and attachment security in the Strange Situation;Belsky;Child Dev.,1987