HOYOS M., L. J., et al. “Reduction of Nitrogen Oxide by Carbon Monoxide in the Presence of Oxygen, With a Palladium Catalyst Supported on Fresh and Aged Alumina”. CT&F - Ciencia, Tecnología Y Futuro, vol. 1, no. 1, Dec. 1995, pp. 55-63, doi:10.29047/01225383.607.