1. G. Bargigia, Impresa e ambiente10, 15 (1992).
2. L. E. Manzer, Catalysis Today13, 13 (1992).
3. World Meteorological Organization (WMO), Report of the ozone trends, Panel report N.18, 1988.
4. F. Trifirò, Chimica e Industria77, 169 (1995).
5. J. N. Driscoll, in Herbert H. Hill and Dennis G. McMinn (Editors), Detectors for Capillary Chromatography, John Wiley & Sons Inc., Chemical Analysis Series121, 51 (1992).