1. Mao CF, Vannice MA (1995) J Catal 154:230
2. Zhang C, He H, Tanaka K (2006) Appl Catal B 65:37
3. Adelman HG, Andrews DG, Devoto RS (1972) SAE Paper : 720693
4. Piotrowski GK, Murrell JD (1987) SAE Paper: 872052
5. Nichols RJ, Clinton EL, King ET, Smith CS, Wineland RJ (1988) SAE Paper: 881200