1. W. J. Mueller, Diplomarbeit, Frankfurt 1972
2. Handbuch der Ionenchromatographie, Biotronik, Frankfurt
3. M. Ferm, Atmos. Environ., 13, 1385 (1979)
4. J. Pitts, Jr., B. J. Finlayson-Pitts, and A. M. Winer Environ. Sci. Tech., 11, 568 (1977)
5. J. Reid, B. K. Garside, J. Shewchun, M. El-Sherbiny, and E. A. Balik, Appl. Opt., JJ., 1806 (1978)