1. Bodenheimer T., 1999. The American health care system: Physicians and the changing medical marketplace. New England Journal of Medicine340:584-588.
2. California Health and Safety Code, Section 128675–128815. (n.d.). Retrieved November 2001 from http://www.leginfo.ca.gov
3. Drummond M. F., O'Brien B. J., Stoddart G. L., Torrance G. W., 1997. Methods for the economic evaluation of health care programmes 2nd ed. Oxford University Press, Oxford, England.
4. Ellis R. P., Pope G. C., Iezzoni L. I., Ayanian J. Z., Bates D. W., Burstin H., Ash A., 1996. Diagnosis-based risk adjustment for Medicare capitation payments. Health Care Financing Review17:101-128.
5. Ellis R. P., Pope G. C., Iezzoni L. I., Ayanian J. Z., Bates D. W., Burstin H., Ash A., 1996. Diagnostic cost group (DCG) and hierarchical coexisting condition (HCC) models for Medicare risk adjustment (Contract No. 500-92-0020) Health Economics Research, Waltham, MA.