Sasongko, D., Luthan, A. F. H., & Wulandari, W. (2016). Modified Two-Step Dimethyl Ether (DME) Synthesis Simulation from Indonesian Brown Coal. Journal of Engineering and Technological Sciences, 48(3), 320-333. https://doi.org/10.5614/j.eng.technol.sci.2016.48.3.6