*Diagnosis-Related Groups

Poss, Jeffrey W, Hirdes, John P, Fries, Brant E, McKillop, Ian, Chase, Mary 2008. Validation of Resource Utilization Groups version III for Home Care (RUG-III/HC): evidence from a Canadian home care jurisdiction. Medical Care. 46 (4) 380-7.
Ikegami, N., Fries, B. E., Takagi, Y., Ikeda, S., Ibe, T. 1994. Applying RUG-III in Japanese long-term care facilities. Gerontologist. 34 (5) 628-39.
Fries, B. E., Ljunggren, G., Winblad, B. 1991. International comparison of long-term care: the need for resident-level classification. Journal of the American Geriatrics Society. 39 (1) 10-6.
Fries, B. E. 1990. Comparing case-mix systems for nursing home payment. Health Care Financing Review. 11 (4) 103-19.
Fries, B. E., Nerenz, D. R., Falcon, S. P., Ashcraft, M. L., Lee, C. Z. 1990. A classification system for long-staying psychiatric patients. Medical Care. 28 (4) 311-23.
Cooney, L. M., Jr., Fries, B. E. 1985. Validation and use of resource utilization groups as a case-mix measure for long-term care. Medical Care. 23 (2) 123-32.
Fries, B. E., Cooney, L. M., Jr. 1985. Resource utilization groups. A patient classification system for long-term care. Medical Care. 23 (2) 110-22.