Rex M., Dethloff K., Handorf D., Herber A., Lehmann R., Neuber R., Notholt J., Rinke A., von der Gathen P., Weisheimer A., and Gernandt H. “Arctic and Antarctic Ozone Layer Observations: Chemical and Dynamical Aspects of Variability and Long-Term Changes in the Polar Stratosphere”. Polar Research, vol. 19, no. 2, Jan. 2000, pp. 193-04, doi:10.3402/polar.v19i2.6545.