Nyandoro, Stephen S., and Elianaso Elimbinzi. “Synthesis, Characterisation and Catalytic Evaluation of Castor Oil-Templated Mesoporous Sulfated Solid Acid Catalysts for Esterification Reaction”. Tanzania Journal of Engineering and Technology, vol. 41, no. 4, Jan. 2023, http://196.44.161.124/index.php/tjet/article/view/5430.