@misc{callies_why_is_2012, 
author={Callies, U.,Scharfe, M.,Paetsch, J.},
title={Why is the model-based explanation of variability in multivariate observations so difficult?},
year={2012},
howpublished = {conference lecture (invited): Helgoland (D); 18.-20.09.2012},
note = {Online available at: \url{} (DOI). Callies, U.; Scharfe, M.; Paetsch, J.: Why is the model-based explanation of variability in multivariate observations so difficult?. Helgoland Roads Jubilaeumssymposium. Helgoland (D), 2012.}}