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Ulrike G. Wartner, Karin Grossmann, Elisabeth Fremmer-Bombik, Gerhard Suess, Attachment Patterns at Age Six in South Germany: Predictability from Infancy and Implications for Preschool Behavior, Child Development, Vol. 65, No. 4 (Aug., 1994), pp. 1014-1027
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Wartner et al. (1994) studied this question.
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