@inproceedings{KMSZ06a,
 author = {Keim, Daniel A. and Mansmann, Florian and Schneidewind, Jörn and Ziegler, Hartmut},
 booktitle = {Information Visualization (IV 2006)},
 organization = {IEEE},
 publisher = {IEEE Press},
 title = {Challenges in Visual Data Analysis},
 year = {2006}
}