1. Geographic and temporal patterns of care in the United States;Barnes,1982
2. Variation in Michigan hospital use rates;Clark,1988
3. Regional variations in the use of common surgical procedures: within and between England and Wales, Canada and the United States of America;McPherson;Soc. Sci. Med.,1981
4. Measuring community hospital services in Michigan;Griffith;Hlth Serv. Res.,1981
5. Regional variation in hospital use in Michigan: a symptom of unnecessary hospital utilization;OHMA,1985