1. Phelps C:Health Economics. New York: HarperCollins, 1992.
2. Phibbs C, Robinson J: A variable radius measure of local hospital market structure.Health Services Research 1993; 28(3):313–324.
3. Goody B: Defining rural hospital markets.Health Services Research 1993; 28(2):183–200.
4. Dranove D, Shanley M: A note on the relational aspects of hospital market definitions.Journal of Health Economics 1989; 8:473–478.
5. Garnick D, Luft H, Robinson J, et al.: Appropriate measures of hospital market areas.Health Services Research 1987; 22(1):69–89.