Nguyen Van Huynh, Pham Van Hai, Duong Thi Thu Hang, Bui Ha Trung, Chu Van Tuan, Tran Trung, Do Thi Anh Thu and Ho Truong Giang 2018. DEVELOPMENT OF NH 3 GAS SENSOR OPERATING AT ROOM TEMPERATURE BASED ON POLYPYRROLE NANO FILMS. UTEHY Journal of Applied Science and Technology. 18, (Jul. 2018), 30-33.