@misc{horstmann_observations_on_1991, 
author={Horstmann, M., Gregory, J. K.},
title={Observations on the Ripple Loading Effect''},
year={1991},
howpublished = {GKSS report},
note = {Horstmann, M.; Gregory, J.: Observations on the Ripple Loading Effect''. Scripta Metallurgica et Materialia. 1991. vol. 25, no. 11, 2503-2506.}}