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Karen Klein Ikkink, Theo van Tilburg, Kees C. P. M. Knipscheer, Perceived Instrumental Support Exchanges in Relationships between Elderly Parents and Their Adult Children: Normative and Structural Explanations, Journal of Marriage and Family, Vol. 61, No. 4 (Nov., 1999), pp. 831-844
Ikkink et al. (Mon,) studied this question.