United States
Morris, J. N., Hawes, C., Fries, B. E., Phillips, C. D., Mor, V., Katz, S., Murphy, K., Drugovich, M. L., Friedlob, A. S. 1990. Designing the national resident assessment instrument for nursing homes. Gerontologist. 30 (3) 293-307.
Fries, B. E., Schneider, D. P., Foley, W. J., Dowling, M. 1989. Case-mix classification of Medicare residents in skilled nursing facilities: resource utilization groups (RUG-T18). Medical Care. 27 (9) 843-58.
Ruchlin, H. S., Morris, J. N., Gutkin, C. E., Sherwood, S. 1989. Expenditures for long-term care services by community elders. Health Care Financing Review. 10 (3) 55-65.