Thach Thi Bo Pha and Lam Thi Thuy Kieu 2025. SIMULTANEOUS ANALYSIS OF FOUR ANALGESIC AND ANTI-INFLAMMATORY COMPOUNDS ILLEGALLY MIXED IN HERBAL MEDICINES BY HPLC – PDA METHOD. TRA VINH UNIVERSITY JOURNAL OF SCIENCE. 15, 2 (Jun. 2025). DOI:https://doi.org/10.35382/tvujs.15.2.2025.124.