@misc{packroff_faunistic_studies_1992, 
author={Packroff, G.},
title={Faunistic studies on the ciliates of three Eifel maar lakes},
year={1992},
howpublished = {journal article},
note = {Packroff, G.: Faunistic studies on the ciliates of three Eifel maar lakes. Archiv fuer Hydrobiologie. 1992. vol. 38, 209-221.}}