Li, Haoyuan, Ping Wei, Jianqiang Wang, Shigui Tang, and Cheng Guo. 2013. “Properties of Cu ZnO Al2O3 Catalysts Modified by Titanium Additives in Synthesis of Methanol from Syngas Using Orthogonal Experimental Design”. Asian Journal of Chemistry 25 (12):6795-6801. https://doi.org/10.14233/ajchem.2013.14695.