[1]
Li, W. et al. 2011. Sulfonic-Acid-Functionalized Silica: An Efficient, Heterogeneous and Reusable Catalyst for the Synthesis of 8-Aryl-7,8-dihydro-[1,3]dioxolo [4,5-g]chromen-6-ones. Asian Journal of Chemistry. 24, 2 (Nov. 2011), 725–728.