Diep Yen Nga Dang, Hong Nhung Vuong, Thi Tam Nguyen, and Thi Thanh Thao Phan. “Microbiological Contamination of Indoor Air in University Classrooms (Case Study: University of Science - Vietnam National University, Ho Chi Minh City)”. Vietnam Journal of Science, Technology and Engineering, vol. 62, no. 4, Dec. 2020, pp. 30-35, doi:10.31276/VJSTE.62(4).30-35.