@misc{koopmann_multielement_determination_1990, 
author={Koopmann, C., Prange, A.},
title={Multielement determination in sediments from the German Wadden Sea},
year={1990},
howpublished = {conference lecture: Vienna (A);},
note = {Koopmann, C.; Prange, A.: Multielement determination in sediments from the German Wadden Sea. 3rd TXRF Workshop. Vienna (A), 1990.}}