Nguyen, T.-T.-T., T.-H.-Y. Le, T.-H.-H. Le, and X.-T. Bui. “STRUVITE: FORMATION FACTORS AND NUTRIENT RECOVERY FROM WASTEWATER”. GeoScience Engineering, vol. 64, no. 1, Apr. 2018, pp. 9-13, http://www.geoscience.cz/ojs/index.php/GSE/article/view/173.