Trung, Dinh Van, Hai Bui Van, Thi Thanh Bao Nguyen, Dong Bang Pham, Thi Kim Oanh Vu, Xuan Tu Nguyen, Viet Tiep Phung, Hong Minh Pham, and Gia Cuong Nguyen. 2022. “Development of Multi-Axis Differential Optical Absorption Spectroscopy System and Its Application in Measuring Atmospheric NO\(_2\) Volume Mixing Ratio in Hanoi”. Communications in Physics 32 (4):361. https://doi.org/10.15625/0868-3166/17173.