1. For the EC see EC Directives Dir. 88/76/EEC, December 1987, Dir. 88/436/EEC, 16 June 1988, and Dir. 89/458/EEC, 18 July 1989.
2. EC Communication COM (89) 662, 2nd February 1990.
3. Harrison, P. G., inChemistry of TinP. G. Harrison, Ed., Chap. 12. Blackie, Glasgow, 1989.
4. The catalytic oxidation of carbon monoxide on tin(IV) oxide
5. The catalytic oxidation of carbon monoxide on SnO2$z.sbnd;CuO gels