Solketal from Glycerol, Aceton, and Ethanol Solution using Woifram Acid Phosphotungistic CatalystMahreni, Lingga Sapto Aji, Setiawiyono Gunawan and Mifta Aulia IkhsanaMATEC Web Conf., 372 (2022) 03003DOI: https://doi.org/10.1051/matecconf/202237203003