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2. Kurland LT, Elveback LR, Nobrega FT: Mayo Clinic records linkage system in the Rochester-Olmsted epidemiology program project, Proceedings of the Sixth International Scientific Meeting on the Uses of Epidemiology in Planning Health Services, Belgrade, 1973, International Epidemiological Association, pp 164–176
3. United States Department of Health, Education, and Welfare: National Health Guidelines, March 28, 197811–12
4. Minnesota Department of Health, Center for Health Statistics: Population, births and deaths, marriages and divorces. Minn Health Stat 1973–1977
5. Planning of specialized health facilities. Size vs. cost and effectiveness in heart surgery;McGregor;N Engl J Med,1978