1. Traumatic injuries of the teeth;Andreasen,1981
2. A review of forty cases of retained fractured roots of anterior teeth;Austin;JADA,1930
3. Long-term prognosis of 66 permanent anterior teeth with root fracture;Zachrisson;Scand J Dent Res,1975
4. En Klinesk og radiologesk undersogeloe of 55 rodfracturer in unge permanente incisver;Ravn;Tend-loegebladet,1976
5. Injuries to the teeth: contusions and fractures resulting from concussion;Anderson;JADA,1944