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Everett Waters, Kathleen E. Deane, Defining and Assessing Individual Differences in Attachment Relationships: Q-Methodology and the Organization of Behavior in Infancy and Early Childhood, Monographs of the Society for Research in Child Development, Vol. 50, No. 1/2, Growing Points of Attachment Theory and Research (1985), pp. 41-65
Waters et al. (Tue,) studied this question.