Nong, G.Z., L.J. Huang, B.C. Lu, S.Q. Li, H.T. Mo, and S.F. Wang. 2012. “Reactions and Technology of Black Liquor Gasification Combined Synthesis of Dimethyl Ether”. Asian Journal of Chemistry 24 (12):5469-72. https://asianpubs.org/index.php/ajchem/article/view/9907.