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2. Nature's method of making perfect root canal fillings following pulp removal with a brief consideration of the development of secondary cementum;Grove;Dent Cosmos,1921
3. Some factors in root canal treatment;Blayney;J Am Dent Assoc,1924
4. Microscopic investigation of root apices;Kuttler;J Am Dent Assoc,1955
5. Deviation of the apical foramen from the radiographic apex;Levy;J N J Dent Soc,1970