1. Early pioneers of oral and maxillofacial radiology;Langland;Oral Surg Oral Med Oral Pathol Oral Radiol Endod,1995
2. Health risks from exposure to low levels of ionizing radiation,2006
3. 1990 Recommendations;Ann ICRP,1991
4. 2007 Recommendations;Ann ICRP,2008
5. Dosimetry of digital panoramic imaging;Gijbels;Dentomaxillofac Radiol,2005