@misc{johnsen_gps_water_2001, 
author={Johnsen, K.-P.},
title={GPS water vapour estimates compared with a NWP model within the BALTEX region},
year={2001},
howpublished = {conference lecture: Sydney (AUS);},
note = {Johnsen, K.: GPS water vapour estimates compared with a NWP model within the BALTEX region. International Geoscience and Remote Sensing Symposium. Sydney (AUS), 2001.}}