1. Chemistry in Britain 20 (1984) 684.
2. P.C. Doolan and P.R. Pujado, Hydroc. Process. (September 1989) 72.
3. D.C. Martindale, P.J. Kuchar and R.K. Olson, AIChE, Summer Nat. Meeting, Denver (U.S.A.), Aug. 21?24 (1988).
4. A.W. Chester, U.S. Pat. 4 350 835 (Sept. 21, 1982).
5. H. Kitagawa, Y. Sendola and Y. Ono, J. Catal. 101 (1986) 12.