@inproceedings{OHR+09,
 author = {Oelke, Daniela and Hao, Ming C. and Rohrdantz, Christian and Keim, Daniel A. and Dayal, Umeshwar and Haug, Lars-Erik and Janetzko, Halldor},
 booktitle = {Proceedings of the 2009 IEEE Symposium on Visual Analytics Science and Technology (VAST '09)},
 doi = {10.1109/VAST.2009.5333919},
 pages = {187-194},
 publisher = {IEEE},
 title = {Visual Opinion Analysis of Customer Feedback Data},
 year = {2009}
}