1. ACS Monograph;A.P. Bolton,1976
2. J.W. Ward, in:Preparation of Catalysts III, Studies in Surface Science and Catalysis, Vol. 16, eds. G. Poncelet, P. Grange and P.A. Jacobs (Elsevier), Amsterdam, (1983) p. 587.
3. I.E. Maxwell, Catal. Today 1 (1987) 385.
4. J.G. Sikonia, W.L. Jacobs and S.A. Gembicki, Hydrocarbon Process. 57 (1978) 117.
5. S.D. Light, R.V. Bertram and J.W. Ward, Hydrocarbon Process. 60 (1981) 93.