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2. Evaluation of precision of length determination with 3 electronic apex locators: Root ZX, Elements Diagnostic Unit and Apex Locator, and Romi APEX D-30;Bernardes;Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology,2007
3. A critical evaluation of some methods of determining tooth length;Bramante;Oral Surgery, Oral Medicine, & Oral Pathology,1974
4. Influence of instrument size on the accuracy of different apex locators: an in vivo study;Briseño-Marroquín;Journal of Endodontics,2008