HA THI THU HOAI; NGUYEN TRONG NGHIA; NGUYEN THI QUYNH HOA. PROCEDURE OPTIMIZATION FOR DETERMINATION OF PERFLUOROOCTANE SULFONIC ACID (PFOS) AND PERFLUOROOCTANOIC ACID (PFOA) IN PAPER – BASED FOOD PACKAGING SAMPLES. UTEHY Journal of Applied Science and Technology, v. 36, p. 27-32, 31 Dec. 2022.