Mguni, L. , Meijboom, R. , Jalama, K. (2012), 'Effect of Calcination Temperature and MgO Crystallite Size on MgO/TiO2 Catalyst System for Soybean Transesterification', World Academy of Science, Engineering and Technology, Open Science Index 64, International Journal of Materials and Metallurgical Engineering, 6(4), 375 - 379.