David Amalraj, S., et al. “A Facile Catalytic One-Pot Synthesis of Benzimidazole and Benzothiazole Compounds Using Amberlite IRA 400-Cl Resin As Green Catalyst”. Asian Journal of Chemistry, vol. 34, no. 7, June 2022, pp. 1653-9, doi:10.14233/ajchem.2022.23595.