@misc{johnsen_validation_of_2001, 
author={Johnsen, K.-P., Rockel, B.},
title={Validation of the NWP model HRM with groundbased GPS data},
year={2001},
howpublished = {journal article},
note = {Johnsen, K.; Rockel, B.: Validation of the NWP model HRM with groundbased GPS data. Physics and Chemistry of the Earth  A. 2001. vol. 26, no. 6 - 8, 463-466.}}