@misc{scharf_physical_and_1992, 
author={Scharf, B. W., Oehms, M.},
title={Physical and chemical characteristics},
year={1992},
howpublished = {GKSS report},
note = {Scharf, B.; Oehms, M.: Physical and chemical characteristics. Archiv fuer Hydrobiologie. 1992. vol. 38, 63-83.}}