Machmudah, S., W. Wahyudiono, H. Kanda, and M. Goto. “Synthesis of Polyhedral Magnetite Particles by Hydrothermal Process under High Pressure Condition”. Journal of Engineering and Technological Sciences, vol. 48, no. 6, Dec. 2016, pp. 753-71, doi:10.5614/j.eng.technol.sci.2016.48.6.8.