Nguyen , Thi Thu Thao, et al. “THE SITUATION, CHARACTERISTICS OF PHENOTYPES ON PATIENTS OF STABLE CHRONIC OBSTRUCTIVE PULMONARY DISEASE AT CAN THO UNIVERSITY OF MEDICINE AND PHARMACY HOSPITAL”. Cantho Journal of Medicine and Pharmacy, no. 39, June 2023, pp. 192-8, https://tapchi.ctump.edu.vn/index.php/ctump/article/view/861.