1. Physician charges under Medicare: Assignment rates and beneficiary liability;Ferry;Health Care Financing Review,1980
2. Econometric theory;Goldberger,1964
3. Gornick, Marian, 1982, Office of Research, Health Care Financing Administration, personal communication to the authors.
4. Factors affecting the incomes of men and women physicians: An exploratory analysis;Kehner;Journal of Human Resources,1976