Triethylammonium hydrogen sulfate ionic liquid as a low-cost solvent: A short review of synthesis, analysis and applicationsS. M. Shahrul Nizan Shikh Zahari, Hazeeq Azman and Latifah KarimMATEC Web Conf., 204 (2018) 00006DOI: https://doi.org/10.1051/matecconf/201820400006