@misc{wiltshire_potential_bioavailable_1990, 
author={Wiltshire, K. H.},
title={Potential bio-available phosphorus in sediments of the river Elbe in nothern Germany},
year={1990},
howpublished = {journal article},
note = {Online available at: \url{} (DOI). Wiltshire, K.: Potential bio-available phosphorus in sediments of the river Elbe in nothern Germany. Archiv fuer Hydrobiologie. 1990. vol. 75, 281-297.}}