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Fries B.E, Mehr D.R, Schneider D., Foley W.J, Burke R..  1993.  Mental dysfunction and resource use in nursing homes. Medical Care. 31(10):898-920.

Clauser S.B, Fries B.E.  1992.  Nursing home resident assessment and case-mix classification: cross-national perspectives. Health Care Financing Review. 13(4):135-55.

Williams B.C, Fries B.E, Foley W.J, Schneider D., Gavazzi M..  1994.  Activities of daily living and costs in nursing homes. Health Care Financing Review. 15(4):117-35.