1. A Clinical and Roentgenological Study of Apicoectomized Teeth;Mattila;Odont. Tidskr,1968
2. Radiographic Criteria for the Assessment of Healing After Endodontic Surgery;Rud;Int. J. Oral Surg,1972
3. Comparison of the Clinical and Roentgenological State of the Re-examination of Root Resections;Lehtinen,1972
4. Results of Apicoectomy;Nordenram,1970
5. Follow-up Study of Apicoectomized Molars;Altonen,1976