@misc{johnsen_validation_of_2000, 
author={Johnsen, K.-P., Rockel, B.},
title={Validation of a regional  weather forecast model with GPS data},
year={2000},
howpublished = {conference lecture: Nizza (F);},
note = {Johnsen, K.; Rockel, B.: Validation of a regional  weather forecast model with GPS data. 25. General  Assembly of the European Geophysical Society - Millennium Conference on Earth, Planetary & Solar Systems Sciences. Nizza (F), 2000.}}