*Diagnosis-Related Groups
        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.