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.