Prodjosantoso, A.K., C. Kusumawardani, M.P. Utomo, and C.T. Handoko. 2017. “Synthesis and Characterization of Ca1-XCoxTiO3 and Its Photocatalytic Activity on Photodegradation of Methylene Blue”. Asian Journal of Chemistry 29 (6):1270-74. https://doi.org/10.14233/ajchem.2017.20461.