Jin, T.-S., Ma, G.-D., Xie, H., & Li, T.-S. (2010). Silica Gel-Supported Tungstosilicic Acid: An Efficient Catalyst for Synthesis of Diacetals. Asian Journal of Chemistry, 20(7), 5053–5059. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/12934