M. Hosseini-Sarvari and S. Najafvand-Derikvandi, “Synthesis of 4-(trifluoromethyl) coumarins using nano sulfated-titania as solid acid catalyst under solvent-free conditions”, Iran. J. Catal., vol. 6, no. 5, Feb. 2024, Accessed: May 30, 2026. [Online]. Available: https://oiccpress.com/ijc/article/view/3935