Utomo, M. P., Shobirin, M., & Prodjosantoso, A. K. (2018). Synthesis, Characterization and Photocatalytic Activity of β-Ca2-xZnxSiO4 (x = 0, 0.01 and 0.025). Asian Journal of Chemistry, 31(2), 293–296. https://doi.org/10.14233/ajchem.2019.21534