Bjorkgren M.A, Hakkinen U., Finne-Soveri U.H, Fries B.E.  1999.  Validity and reliability of Resource Utilization Groups (RUG-III) in Finnish long-term care facilities. Scandinavian Journal of Public Health. 27(3):228-34.

Ensberg M.D, Paletta M.J, Galecki A.T, Dacko C.L, Fries B.E.  1993.  Identifying elderly patients for early discharge after hospitalization for hip fracture. Journal of Gerontology. 48(5):M187-95.

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.

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.