Kumar Gupta, Arun, and Goutam Deo. “Enhancement in Activity and Reusability of Dry Amberlyst-15 Catalyst by Thermal Treatment for Production of Biodiesel from Karanja Oil”. Asian Journal of Chemistry, vol. 35, no. 1, Dec. 2022, pp. 62-68, doi:10.14233/ajchem.2023.24026.