1. M.A. Wójtowicz, J.R. Pels and J.A. Moulijn, Fuel Process. Technol. 34 (1993) 1.
2. P.J. Crutzen, in: B. Bolin and R.B. Cook, eds. (Wiley, New York, 1983) pp. 67?112.
3. J.W. Elkins and R. Rossen, Summary Report 1988: Geophysical monitoring for climatic change, NOAAERL, Boulder (1989).
4. J.T. Houghton, G.J. Jenkins and J.J. Ephraums, eds.,Climate Change, The IPCC Scientific Assessment (Press Syndicate of the University of Cambridge, London, 1990).
5. Y. Li and J.N. Armor, Appl. Catal. B 1 (1992) L21.