Effect of Calcium Additive on the Crystallization of StruviteDyah Suci Perwitasari, Luluk Edahwati, S. Sutiyono, Novel Karaman, J. Jamari, Stefanus Muryanto and Athanasius.P. BayusenoMATEC Web of Conferences, 58 (2016) 01007DOI: https://doi.org/10.1051/matecconf/20165801007