Görlach, Ekkehard, R. Rosendahl, U. Klein, H.-J. Stöckmann, A. Schrimpf, ESR and optical absorption of Ag in a N2 matrix, Annalen der Physik, 7. Folge, Band 47, Heft 7, 568-576, 1990.

Nett, Herbert, S. Crewell, U. Klein, J. Langen, Submillimeter Wave Radiometry, Proceedings of the First European Workshop on Polar Stratospheric Ozone, Schliersee, Germany, September 1990, ISBN 2-827263-060-0, 81-84, 1991.

Klein, Ulf, Aufbau und Betrieb eines breitbandigen, bodengestützten Millimeter-Wellen- Radiometers zur Messung atmosphärischer Spurenstoffe, Dissertation, Universität Bremen, Verlag Shaker, ISBN 3-86111-691-X, Aachen, 1993.

M. Boheim. L.-P. Schmidt, J. Ritter, V. Brankovic, R. Beyer, F. Arndt, U. Klein, K. Künzi, G. Schwaab and T. W. Crowe, A New 140 GHz Planar Diode Finline Mixer for Radiometer Applications, Proceedings of the European Microwave Conference, 142-147, 1993.

Klein, Ulf, G. W. Schwaab, K. F. Künzi, U. Raffalski, Measurements of Stratospheric Ozone and Chlorine Monoxide with a Ground-Based Microwave Receiver at Ny-Ålesund, Spitsbergen, XIX. General Assembly of the European Geophysical Society, Grenoble, poster, 1994.

Schwaab, Gerhard W., U. Klein, K. F. Künzi, U. Raffalski, Millimeter-Wave Measurements at the Arctic NDSC-Station Ny-Ålesund in the Winters of 1992/93 and 1993/94, Proc. of the International Geoscience and Remote Sensing Symposium, Pasadena, 1690-1692, 1995.

Raffalski, U., B.-M. Sinnhuber, K. Künzi, J. Langer and G. Schwaab, Millimeter wave observations of chlorine monoxide at Ny-Ålesund, Spitsbergen, in the winters 1993/94 and 1994/95, Proceedings of the Third European Workshop on Polar Stratospheric Ozone, Schliersee, Germany, September 1995, ISBN 92-827-5722-6, 303-306, 1996.

Sinnhuber, B.-M., K. Künzi, J. Langer, U. Raffalski, and G. Schwaab, Ground-based millimeter wave monitoring of ozone at Ny-Ålesund, Spitsbergen from 1993 to 1995, Proceedings of the Third European Workshop on Polar Stratospheric Ozone, Schliersee, Germany, September 1995, ISBN 92-827-5722-6, 473-476, 1996.

Klein, Ulf, S. Crewell, R. L. DeZafra, Correlated millimeter wave measurements of ClO, N2O and HNO3 from McMurdo, Antarctica, during polar spring 1994, J. of Geophys. Res., Vol. 101, NO. D15, 20.925-20932, 1996.

Cheng, Dongjie, S. Crewell, U. Klein, R. L. de Zafra, Millimeter wave spectroscopic measurements over the South Pole 4. O3 and N2O during 1995 and their correlations for two quasi annual cycles, J. of Geophys. Res., Vol. 102, NO. D5, 6.109-6.116, 1997.

Langer, Jens, U. Klein, K. F. Künzi, U. Raffalski, B.-M. Sinnhuber, A Versatile Millimeter Wave Radiometer for spectroscopic Measurements of Atmospheric Trace Gases, Proceedings of the XVIII Quadrennial Ozone Symposium, L’Aquila, Italy, September 12-21, 1996, ed. R.D. Bojkov and G. Visconti, 931-934, printed by Edigrafital - S. Atto, Italy, 1998.

Raffalski, Uwe, U. Klein, K. F. Künzi, J. Langer, B.-M. Sinnhuber, Arctic Stratospheric Ozone and Chlorine Monoxide and Water Vapor at the NDSC-Station Ny Ålesund, Spitsbergen, 1994-1996, Proceedings of the XVIII Quadrennial Ozone Symposium, L’Aquila, Italy, September 12-21, 1996, ed. R.D. Bojkov and G. Visconti, 931-934, printed by Edigrafital - S. Atto, Italy, 1998.

Sinnhuber, Björn-Martin, U. Klein, K. F. Künzi, J. Langer, U. Raffalski, On Short- and Long-term Variability of Arctic Stratospheric Ozone, Proceedings of the XVIII Quadrennial Ozone Symposium, L’Aquila, Italy, September 12-21, 1996, ed. R.D. Bojkov and G. Visconti, 931-934, printed by Edigrafital - S. Atto, Italy, 1998.

Klein, Ulf, D. Cheng, S. Crewell, R. L. DeZafra, Variations in Springtime Peak Mixing Ratio of Chlorine Monoxide at McMurdo Station, Antarctica, from, 1987 to 1995, Proceedings of the XVIII Quadrennial Ozone Symposium, L’Aquila, Italy, September 12-21, 1996, ed. R. D. Bojkov and G. Visconti, 931-934, printed by Edigrafital - S. Atto, Italy, 1998.

R. L. DeZafra, D. T. Shindell, S. Crewell, U. Klein, and D. Cheng, A Review of Results from a Decade of Ground-Based ClO Observations in the Antarctic Springtime, Proceedings of the XVIII Quadrennial Ozone Symposium, L’Aquila, Italy, September 12-21, 1996, ed. R. D. Bojkov and G. Visconti, 635-638, printed by Edigrafital - S. Atto, Italy, 1998.

Tuckermann, Rudolf, U. Klein, K. F. Künzi, BRE-RAM: A Ground-based mm-Wave Ozone Radiometer at Bremen, Germany, Proceedings of the Fourth European Symposium on Ozone Research, Schliersee, Germany, September 1997, 732-735, ISBN 92-828-2365-2, 1998.

Sinnhuber, Björn-Martin, U. Klein, V. Eyring, J. Trentmann, R. Müller, H. Bovensmann, J. P. Burrows, K. F. Künzi, Dynamically Controlled Photochemistry of Mid-Stratospheric Ozone, Proceedings of the Fourth European Symposium on Ozone Research, Schliersee, Germany, September 1997, 313-315, ISBN 92-828-2365-2, 1998.

Langer, Jens, B.-M. Sinnhuber, U. Klein, K. F. Künzi, On the Evolution of Arctic Lower Stratospheric Ozone in Spring 1997, Ground-Based Microwave Measurements at Ny-Ålesund, Spitsbergen, Proceedings of the Fourth European Symposium on Ozone Research, Schliersee, Germany, September 1997, 209-211, ISBN 92-828-2365-2, 1998.

Klein, Ulf, B. Franke, J. Langer, U. Raffalski, B.-M. Sinnhuber, K. F. Künzi, R. L. DeZafra, M. McDonald, V. Nagar, G. Hochschild, H. Berg, G. Kopp, R, Krupa, M. Kunz, H. Masuko, S. Ochiai, Chlorine Monoxide Radiometer Intercomparison in Ny-Ålesund, 1997, Proceedings of the Fourth European Symposium on Ozone Research, Schliersee, Germany, September 1997, 689-691, ISBN 92-828-2365-2, 1998.

Raffalski, Uwe, B. Franke, U. Klein, J. Langer, B.-M. Sinnhuber, K. F. Künzi, Enhanced Chlorine Monoxide above Spitsbergen in Spring 1997 measured by the Ground-Based mm-Wave Radiometer RAM, Proceedings of the Fourth European Symposium on Ozone Research, Schliersee, Germany, September 1997, 382-384, ISBN 92-828-2365-2, 1998.

Franke, Bernd, U. Klein, J. Langer, U. Raffalski, B.-M. Sinnhuber, R. Tuckermann, F. Wittrock, K. F. Künzi, Simultaneous Ground-Based Measurements of ClO, OClO and BrO at the NDSC Station Ny-Ålesund, Spitsbergen, Proceedings of the Fourth European Symposium on Ozone Research, Schliersee, Germany, September 1997, 327-329, ISBN 92-828-2365-2, 1998.

Raffalski, Uwe, U. Klein, B. Franke, J. Langer, B.-M. Sinnhuber, J. Trentmann, K. F. Künzi and O. Schrems, Ground based millimeter-wave observations of Arctic chlorine activation during winter and spring 19996/97, Geophys. Res. Lett. Vol. 25, No. 17, 3331-3334, 1998.

Sinnhuber, Björn-Martin, J. Langer, U. Klein, U. Raffalski, K. F. Künzi and O. Schrems, Ground based millimeter-wave observations of Arctic ozone depletion during winter and spring 19996/97, Geophys. Res. Lett. Vol. 25, No. 17, 3327-3330, 1998.

Langer, Jens, U. Klein, B. Barry, B.-M. Sinnhuber, I. Wohltmann, and K. F. Künzi, Chemical Ozone Depletion during Arctic Winter 1997/98 Derived from Ground Based Millimeter-Wave Observations, Geophys. Res. Lett. Vol. 26 ,No. 5 , 599-602, 1999.

Sinnhuber, Björn-Martin, R. Müller, H. Bovensmann, V. Eyring, U. Klein, J. Langer, J. Trentmann, J. Burrows, and K. Künzi, Interpretation of mid-stratospheric Arctic ozone measurements using a photochemical box-model, Journal of Atmospheric Chemistry, in press, 1999.

Steinbrecht, Wolfgang, R. Neuber, P. v. d. Gathen, P. Wahl, T. J. McGee, M. R. Gross, U. Klein, J. Langer, Results of the 1998 Ny-Ålesund Ozone Measurements Intercomparison NAOMI, J. of Geophys. Res., in press 1999.

Klein, Ulf et al., Chlorine Monoxide Radiometer Intercomparison at Ny-Ålesund, Spitsbergen, 1997, submitted to J. of Geophys. Res., 1999.

Klein, Ulf, B. Barry, K. Lindner, I. Wohltmann, K. F. Künzi, Winter and Spring Observations of Stratospheric Chlorine Monoxide from Ny-Ålesund, Spitsbergen, in 1998 and 1999, submitted to Geophys. Res. Lett., 1999.