Siew-Theng, Foo, Wan- Loy Chu, and Phang, Siew-Moi. “Tolerance of Four Malaysian Chlorophytes to Nitrate and Ammonium Pollution”. Malaysian Journal of Science 20, no. 1 (April 26, 2001): 15–20. Accessed July 1, 2024. https://jpmm.um.edu.my/index.php/MJS/article/view/8770.