L. F. Razon, C. M. Salazar, H. Niiyama, and L. T. N. Doan, “Preparation and Activity of Precipitated Ni-MgO/Al2O3 Catalysts for the Partial Oxidation of Methane”, ASEAN J. Chem. Eng., vol. 7, no. 2, pp. 108-109, Dec. 2007.