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Charles E. Cunningham, Linda S. Siegel, H. I. J. van der Spuy, M. Louise Clark, S. Jane Bow, The Behavioral and Linguistic Interactions of Specifically Language-Delayed and Normal Boys with Their Mothers, Child Development, Vol. 56, No. 6 (Dec., 1985), pp. 1389-1403
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Cunningham et al. (1985) studied this question.
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