Wang, Desheng, Liang Yan, and Xiaolai Wang. “Green Synthesis of N-Sulfonylimine in Solvent-Free Condition With Heteropoly Acid As Catalyst”. Asian Journal of Chemistry 24, no. 6 (February 10, 2012): 2724–2726. Accessed June 30, 2024. https://asianpubs.org/index.php/ajchem/article/view/9223.