@misc{callies_on_the_1995, 
author={Callies, U., Eppel, D. P.},
title={On the sensitivity of a least-squares fit of discretized linear hyperbolic equations to data},
year={1995},
howpublished = {journal article},
note = {Callies, U.; Eppel, D.: On the sensitivity of a least-squares fit of discretized linear hyperbolic equations to data. Tellus  A. 1995. vol. 47, no. 1, 80-102.}}