@misc{scharf_eifel_maar_1989, 
author={Scharf, B. W.},
title={Eifel maar lakes: The historical side of Thienemanns studies},
year={1989},
howpublished = {book part},
note = {Scharf, B.: Eifel maar lakes: The historical side of Thienemanns studies. In: Lampert, W.; Rothhaupt, K. (Ed.): Limnology in the Federal Republic of Germany. 1989. 37-40.}}