Rajanna, K.C., et al. “Rate Enhancements Due to Ultrasound in Isoquinolinium Dichromate and Isoquinolinium Chlorochromate Catalyzed Chlorination of Aromatic Compounds in Presence of KHSO4 KCl”. Asian Journal of Chemistry, vol. 30, no. 1, Nov. 2017, pp. 167-70, doi:10.14233/ajchem.2018.20963.