@misc{proefrock_combined_esi_2009, 
author={Proefrock, D.,Prange, A.},
title={Combined ESI and ICP-MS approach for the quantification of bio-molecules using natural element tags},
year={2009},
howpublished = {conference lecture: Mainz (D); 15.-18.09.2009},
note = {Online available at: \url{} (DOI). Proefrock, D.; Prange, A.: Combined ESI and ICP-MS approach for the quantification of bio-molecules using natural element tags. 12th Workshop on Progress in Analytical Methodologies for Trace Metal Speciation, TraceSpec 2009. Mainz (D), 2009.}}