1. Lake, T. H., Bending, R. G., Williams, G. P., Beaumont, A. J., Warburton, A., and Andersson, J., SAE technical paper 1999-01-1281.
2. Klein, H., Lopp, S., Lox, E., Kwanami, M., and Horiuchi, M., SAE technical paper 1999-01-0109.
3. Luders, H., Stommel, P., and Geckler, S., SAE technical paper 1999-01-1018.
4. Reduction of nitrogen oxides with hydrocarbons catalyzed by bifunctional catalysts
5. Penetrante, B. M., Brusasco, R. M., Merritt, B. T., Pitz, W. J., Vogtlin, G. E., Kung, M. C., Kung H. H., Wan, C. Z., and Voss, K. E., SAE technical paper 982508.