V. R.  Choudhary, Mondal, K. C., and Choudhary, T. V., ?Oxy-methane reforming over high temperature stable NiCoMgCeOx and NiCoMgOx supported on zirconia-haffnia catalysts: accelerated sulfur deactivation and regeneration?, Catalysis Communications, vol. 8, no. 3, pp. 561-564, 2007.