Dabbit, O., and M. Al-agha. 2016. “Heterogeneously Novel xWO3/SO42-/SnO2 Catalysts to Improve the Direct Etherification of Glycerol With D-Glucose in Absence of Organic Solvents”. Journal of Qassim University for Science 9 (2):165-79. https://jnsm.qu.edu.sa/index.php/jnm/article/view/1807.