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Liliana J. Lengua, Mark W. Roosa, Erika Schupak-Neuberg, Marcia L. Michaels, Carolyn Nourse Berg, Louis F. Weschler, Using Focus Groups to Guide the Development of a Parenting Program for Difficult-to-Reach, High-Risk Families, Family Relations, Vol. 41, No. 2 (Apr., 1992), pp. 163-168
Lengua et al. (Wed,) studied this question.
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