1. Endodontic therapy in a mandibular second bicuspid with four canals;Bram;Journal of Endodontics,1991
2. Microscopes in endodontics;Carr;Journal of California Dental Association,1992
3. Three root canals in mandibular second premolars: Literature review and case report;ElDeeb;Journal of Endodontics,1982
4. Double canals in single roots;Green;Oral Surgery, Oral Medicine and Oral Pathology,1973