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3. How hazardous is dental roentgenography?;Richards;Oral Surg,1961
4. Determination of the average facial and gonadal exposure dose of X-radiation for a dental clinic patient population;Behan;IADR Preprinted Abstracts,1967
5. Mortality of dentists, 1955–1960;American Dental Association, Bureau of Economic Research and Statistics;JADA,1962