Simpen, I. N., Winaya, I. N. S., Subagia, I. D. G. A. and Suyasa, I. W. B. (2022) “Green Nano-Composite of CaO/K-Sulfated TiO2 and Its Potential as a Single-Step Reaction Solid Catalyst for Biofuel Production”, KnE Life Sciences, 7(3), pp. 382–392. doi: 10.18502/kls.v7i3.11146.