Rusnaeni, N., W. Purwanto W., M. Nasikin, and L. Hendrajaya. “The Influence of Pt Atomic Ratio in the Activity PtNi/C Nanocatalysts for the PEMFC”. Journal of Engineering and Technological Sciences, vol. 43, no. 1, Sept. 2013, pp. 1-10, doi:10.5614/itbj.eng.sci.2011.43.1.1.