A Ismail, S., W. M O Al-Ashou, and R. A Al-Askary. “Evaluation of the Apical Seal in Root Canals Prepared With Rotary ProTaper Files and Obturated by Different Methods”. Al-Rafidain Dental Journal, vol. 11, no. 2, June 2011, pp. 390-6, doi:10.33899/rden.2011.45468.