1. The microscopic appearance of the periapical tissue in cases classified as “uncertain” or “unsuccessful” after apicoectomy;Arwill;Odontol. Revy,1974
2. Endodontisk behandling och periapikalstatus II;Bergenholtz;Tandlakartidningen,1973
3. Evaluation of surgical endodontic procedures, Dent;Buch;Radiogr. Photogr,,1962
4. Apicoectomy followed by unusual radiologic finding;Everett;Oral Surg.,1951
5. Tissue reactions to root filling materials;Feldmann;Odontol, Revy,1962