1. Variations in medical care among small areas;Wennberg;Sci Am,1982
2. Health care financing trends: health expenditures in major industrialized countries, 1960–1987;Scheiber;Health Care Financing Rev,1990
3. Economist;Health care survey,1991
4. Financing and delivering health care: a comparative analysis of OECD countries;Organization for Economic Cooperation and Development;Social Policies Studies (Paris),1987