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2. Removal or retention of molar teeth: the problem of the furcation;Saxe;Dent Clin North Am,1969
3. The long term evaluation of periodontal treatment and maintenance in 95 patients;Becker;Int J Periodont Restorative Dent,1984
4. Root amputation and tooth hemisection;Basaraba;Dent Clin North Am,1969
5. Furcation involvement in maxillary and mandibular molars;Ross;J Periodontol,1980