@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},
title={{Visual Opinion Analysis of Customer Feedback Data}},
booktitle={Proceedings of the 2009 IEEE Symposium on Visual Analytics Science and Technology (VAST '09)},
publisher={IEEE},
pages={187-194},
doi={10.1109/VAST.2009.5333919},
year={2009}
}