1. Brynolf I 1967 A histological and roentgenographical study of the periapical region of human upper incisors Odontologisk Revy 18 Suppl. 11
2. Roentgenographic periapical diagnosis I. Reproducibility of the interpretation;Brynolf;Swedish Dental Journal,1970
3. C-shaped canal configurations in mandibular molars;Cooke;Journal of the American Dental Association,1979
4. Reliability of radiographic interpretations;Gelfand;Journal of Endodontics,1983
5. Endodontic success - Who is reading the radiograph?;Goldman;Oral Surgery, Oral Medicine and Oral Pathology,1972