@misc{petersen_assessment_of_2001, 
author={Petersen, W.,Callies, U.},
title={Assessment of Primary Production by Statistical Analysis of Water-Quality Data},
year={2001},
howpublished = {conference poster: Bad Wildungen (D); 21.-23.05.2001},
note = {Online available at: \url{} (DOI). Petersen, W.; Callies, U.: Assessment of Primary Production by Statistical Analysis of Water-Quality Data. In: Jahrestagung der Wasserchemischen Gesellschaft der GDCh. Bad Wildungen (D). 2001.}}