Ngo TH, Dang TV, Vu ND, Nguyen TLS. Analyzing the time-frequency impact of digital transformation on the improvement of service trade in Vietnam. JFMR [Internet]. 2024 Nov. 25 [cited 2026 Mar. 4];15(8):69-85. Available from: https://jfm.edu.vn/index.php/jfme/article/view/714