@inproceedings{callies_analysing_covariance_2000, 
author={Callies, U. and Petersen, W.},
title={Analysing Covariance Structures in Water-Quality Data},
year={2000},
booktitle = {TIES / SPRUCE 2000, Current Environmental Issues: Quantitative Methods},
note = {Callies, U.; Petersen, W.: Analysing Covariance Structures in Water-Quality Data. In: TIES / SPRUCE 2000, Current Environmental Issues: Quantitative Methods. Sheffield (GB), 04.-08.09.2000, 2000.}}