@misc{willumeit_experimental_reports_1999, 
author={Willumeit, R., Forthmann, S.},
title={Experimental Reports SANS-1 1998},
year={1999},
howpublished = {GKSS report},
note = {Willumeit, R.; Forthmann, S.: Experimental Reports SANS-1 1998. GKSS 99-E-12. 1999.}}