Noviyanti, A. R., Prijamboedi, B., Marsih, I. N., & Ismu, I. (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