1. C.F. Claus, British Patent 5958 (1883).
2. J.W. Estep, G.T. McBride Jr., J.R. West, Advances in Petroleum Chemistry and Refining, Vol. 6, Interscience, New York, 1962, Chapter 7, p. 315.
3. Anon, Keeping abreast of the regulations, Sulphur 231 (1994) 35.
4. Catalytic and adsorptive desulphurization of gases