1. L. S. Bernstein, SAE 710014 (1971).
2. M. Shelef, H. S. Gandhi, Ind. Eng. Chem. Prod. Res. Develop. 11, 393 (1972).
3. E. W. Bell, M. Tagami, J. Phys. Chem., 67, 2434 (1963), also T. P. Kobylinski, B. W. Taylor, J. E. Young, SAE 740250 (1974).
4. R. L. Klimisch. K. C. Taylor, Spring Meeting of the California Catalysis Society, California, April 28–29 (1972), also Env. Scu & Tech. 7, 127 (1973).
5. S. Brunauer, P. H. Emmett, E. Teller, J. Amer. Chem. Soc., 60, 309 (1938).