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 [Internet]. 2023 Jun. 12 [cited 2026 Sep. 29];(29):52-8. Available from: https://tapchi.ctump.edu.vn/index.php/ctump/article/view/1583