@misc{wilken_mercury_and_1991, 
author={Wilken, R.-D., Hintelmann, H.},
title={Mercury and methylmercury in sediments and suspended particles from the river Elbe, North Germany},
year={1991},
howpublished = {GKSS report},
note = {Wilken, R.; Hintelmann, H.: Mercury and methylmercury in sediments and suspended particles from the river Elbe, North Germany. Water, Air, and Soil Pollution. 1991. vol. 56, 427-437.}}