@misc{koopmann_multielement_determination_1991, 
author={Koopmann, C.,Prange, A.},
title={Multielement determination in sediments from the German Wadden Sea},
year={1991},
howpublished = {journal article,GKSS report},
note = {Online available at: \url{} (DOI). Koopmann, C.; Prange, A.: Multielement determination in sediments from the German Wadden Sea. Spectrochimica Acta  B. 1991. vol. 46, no. 10, 1395-1402.}}