Akhtar, M. S., A. Agarwal, M. A. Malick, S. Khan, S. Yadav, and S. Agarwal. “Evaluation of Apical Debris Extrusion During Root Canal Preparation Using Hand K File, Revo S, Protaper Next and Wave One File System: An in Vitro Study.”. UNIVERSITY JOURNAL OF DENTAL SCIENCES, Vol. 6, no. 2, Sept. 2020, pp. 16-21, doi:10.21276/ujds.2020.6.2.22.