1. J.K. Minderhoud, Shell International Research, Europ. Patent Appl. no. 84200614.0, May 1984
2. E. Iglesia, S.L. Soled, R.A. Fiato, Exxon Res. Ing. Co., US Patent 4 794 099, December 1988
3. R.A. Fiato, E. Iglesia, S.L. Soled, Exxon Res. Ing. Co., Europ. Patent Appl. no. 90313466.6, April 1990
4. E. Iglesia, S.L. Soled, R.A. Fiato, Exxon Res. Ing. Co., US Patent 4 960 801, October 1990
5. H. Beuther, C.L. Kibby, T.P. Koblinski, R.B. Pannell, Gulf Research & Development, US Patent 4 613 624, September 1986