S. Veluturla, A. M. Sagar, V. K. Venkatesh, A. Gangegowda, and A. Shariff, “Silica extracted from ragihusk as heterogeneous catalyst for synthesis of biodiesel from waste cooking oil”, Iran. J. Catal., vol. 14, no. 3, Jul. 2024, doi: 10.57647/j.ijc.2024.1403.23.