Ho NCV, Nguyen KX, Le MMQ, Do DGH. THE VALUE OF PROPORTIONAL BASIC RULE IN ENDODONTIC WORKING LENGTH DETERMINATION AT DIFFERENT FILE POSITIONS IN ROOT CANALS. CTJUMP. 2023;(29):52-58. Accessed September 29, 2026. https://tapchi.ctump.edu.vn/index.php/ctump/article/view/1583