Conversion of carbon oxides into methane in a nonthermal plasma-catalytic reactor E.J. Jwa, Y.S. Moks and S.B. Lee Eur. Phys. J. Appl. Phys., 56 2 (2011) 24025 Published online: 28 October 2011 DOI: 10.1051/epjap/2011110149