Hafiza Ibrahim, E., Ahmad Tajuddin, N. and Hamzah, N. (2019) “Synthesis and Characterization of Alkali Free Mg-Al Layered Double Hydroxide for Transesterification of Waste Cooking Oil to Biodiesel: Effect of Mg/Al Ratio”, International Journal of Engineering & Technology, 7(4.14), pp. 154–157. doi:10.14419/ijet.v7i4.14.27518.