Noviyanti, Atiek Rostika, Bambang Prijamboedi, I Nyoman Marsih, and Ismunandar Ismu. 2013. “Hydrothermal Preparation of Apatite-Type Phases La9.33Si6O26 and La9M1Si6O26.5 (M = Ca, Sr, Ba)”. Journal of Mathematical and Fundamental Sciences 44 (2):193-203. https://doi.org/10.5614/itbj.sci.2012.44.2.8.