V. R.  Choudhary, Deshmukh, G. M., and Pataskar, S. G., ?Low-temperature complete combustion of a dilute mixture of methane and propane over transition-metal-doped ZrO2 catalysts: effect of the presence of propane on methane combustion?, Environmental Science and Technology, vol. 39, no. 7, pp. 2364-2368, 2005.