@misc{callies_a_case_1998, 
author={Callies, U., Rhodin, A., Eppel, D. P.},
title={A case study on variational soil moisture analysis from atmospheric observations},
year={1998},
howpublished = {journal article},
note = {Callies, U.; Rhodin, A.; Eppel, D.: A case study on variational soil moisture analysis from atmospheric observations. Journal of Hydrology. 1998. vol. 213, 95-108.}}