Song S, Liu W, Ma J, Qi J. [HSO3-pmim][CH3SO3] Catalyzed One-Pot Protocol for the Synthesis of Coumarins Under Solvent-Free Conditions. ajc [Internet]. 2012 May 14 [cited 2024 Jul. 22];24(10):4433-5. Available from: https://asianpubs.org/index.php/ajchem/article/view/9670