@misc{vollmer_seasonal_variations_1990, 
author={Vollmer, M., Hudec, B., Knauth, H.-D., Schwedhelm, E.},
title={Seasonal variations of mineralogical composition and heavy metal contamination of suspended matter in the river Elbe estuary},
year={1990},
howpublished = {book part},
note = {Vollmer, M.; Hudec, B.; Knauth, H.; Schwedhelm, E.: Seasonal variations of mineralogical composition and heavy metal contamination of suspended matter in the river Elbe estuary. In: Michaelis, W. (Ed.): Estuarine water quality management: monitoring, modelling and research - Coastal and estuarine studies. Berlin: Springer. 1990. 153-158.}}