Tran , Thi Truc Uyen, et al. “THE EVALUATION OF TREATMENT RESULTS OF CROWN LENGTHENING SURGERY AT CAN THO UNIVERSITY OF MEDICINE AND PHARMACY HOSPITAL IN 2019 - 2021”. Cantho Journal of Medicine and Pharmacy, no. 39, June 2023, pp. 111-8, https://tapchi.ctump.edu.vn/index.php/ctump/article/view/848.