Azimi, Saeid, et al. “Friedel–Crafts Synthesis of Triarylmethanes over 3-Methyl-1-Sulfonic Acid Imidazolium Tetrachloroaluminate under Solvent-Free Conditions”. Iranian Journal of Catalysis, vol. 5, no. 3, Feb. 2024, https://oiccpress.com/ijc/article/view/3861.