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2. Estimates from the U.S. Public Health Service 1970 X-Ray Exposure Study, Department of Health, Education, and Welfare, U.S. Public Health Service, Bureau of Radiological Health, Washington, D. C. (1972)
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5. R. C. Brooks, S. J. Dwyer III, G. S. Lodwick: Technical Report IAL-TR 25-73, Image Analysis Laboratory, Bioengineering Program, Departments of Electrical Engineering and Radiology, University of Missouri-Columbia, Columbia, Missouri (1973)