Phan, Hong Phuoc, Manh Hung Chu, and Van Duy Nguyen. “NO₂ Gas Sensing Characteristics of SnO₂ Nanofiber-Based Sensors”. Old Journal, no. 142A (June 15, 2020): 23–27. Accessed October 5, 2025. https://jst.vn/index.php/old/article/view/535.