@misc{wiltshire_the_fractionation_1988, 
author={Wiltshire, K.},
title={The fractionation of phosphorus in sediments of the river Elbe under anaerobic conditions},
year={1988},
howpublished = {GKSS report},
note = {Online available at: \url{} (DOI). Wiltshire, K.: The fractionation of phosphorus in sediments of the river Elbe under anaerobic conditions. GKSS 88-E-50. 1988.}}