Toan Phan, Phuoc, Trung Thanh Nguyen, Nhat Huy Nguyen, and Surapol Padungthon. 2019. “A Simple Method for Synthesis of Triamine-SiO2 Material Toward Aqueous Nitrate Adsorption: DOI: 10.32526/Ennrj.17.4.2019.31”. Environment and Natural Resources Journal 17 (4). Nakhon Pathom, Thailand:59-67. https://ph02.tci-thaijo.org/index.php/ennrj/article/view/205216.