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Bernard Farber, Samuel A. Kirk, Family Organization and Crisis: Maintenance of Integration in Families with a Severely Mentally Retarded Child, Monographs of the Society for Research in Child Development, Vol. 25, No. 1, Family Organization and Crisis: Maintenance of Integration in Families with a Severely Mentally Retarded Child (1960), pp. 1+3-91+93-95
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Farber et al. (1960) studied this question.
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