Hosseini-Sarvari M, Najafvand-Derikvandi S. Synthesis of 4-(trifluoromethyl) coumarins using nano sulfated-titania as solid acid catalyst under solvent-free conditions. Iran. J. Catal. 2024 Feb. 3;6(5). Available from: https://oiccpress.com/ijc/article/view/3935