@misc{scharf_limnology_of_1992, 
author={Scharf, B. W., Bjoerk, S.},
title={Limnology of Eifel maar lakes},
year={1992},
howpublished = {journal article},
note = {Scharf, B.; Bjoerk, S.: Limnology of Eifel maar lakes. Archiv fuer Hydrobiologie. 1992. vol. 38, 348.}}