@misc{wilken_monitoring_of_1990, 
author={Wilken, R.-D.,Diehl, R.},
title={Monitoring of radioactivity in the Elbe estuary},
year={1990},
howpublished = {book part},
note = {Online available at: \url{} (DOI). Wilken, R.; Diehl, R.: Monitoring of radioactivity in the Elbe estuary. In: Michaelis, W. (Ed.): Estuarine water quality management: monitoring, modelling and research - Coastal and estuarine studies. Berlin: Springer. 1990. 295-300.}}