1. What physician's assistants can do: probing for the outer limits of substitution;Record;Cost Effectiveness of Physician's Assistants in a Maximum-Substitution Model,1978
2. A disease classification system for analysis of medical care utilization, with a note on symptom classification;Hurtado;Health Serv. Res.,1971
3. The National Ambulators Medical Care Survey: 1975 Summary;National Center for Health Statistics,1978
4. The effect of health care organization on services to the aging;McCabe,1979
5. Some Information Descriptive of a Successfully Operating HMO;Saward,1973