1. Bureau of Radiological Health and National Center for Health Statistics. Population exposure to X rays, U. S., 1970,1973
2. Population exposure to X rays, U.S., 1964;Gitlin,1966
3. American Dental Association, Council on Dental Materials and Devices,1972
4. A state program for reducing radiation exposure from dental X-ray machines;Travis;Am J Public Health,1970
5. How safe are X rays?;Michaelson;Today’s Health,1968