Ngan, Han, 		Xuan Co, Hoang, 		Thi Thu Ha, Pham, AND 		Manh Khai, Nguyen.
" Study on Acidity and Neutralizing Ability of Ions  in the Chemical Composition of Rainwater" <em>VNU Journal of Science: Earth and Environmental Sciences</em> [Online], Volume 37 Number 2 (27 June 2021)