Juan Yang, Li, Yuping Yang, and Ruoyi Dong. “Synthesis of N-Acyl Carbamates and Oxazolidinones Using HClO4-SiO2 As Catalyst Under Solvent-Free Conditions”. Asian Journal of Chemistry 23, no. 3 (November 18, 2010): 1085–1087. Accessed November 24, 2024. https://asianpubs.org/index.php/ajchem/article/view/16089.