@inproceedings{mcdougall2009beyond,
  title={Beyond emoticons: Combining affect and cognition in icon design},
  author={McDougall, Sin{\'e} and Reppa, Irene and Smith, Gary and Playfoot, David},
  booktitle={International Conference on Engineering Psychology and Cognitive Ergonomics},
  pages={71--80},
  year={2009},
  organization={Springer, Berlin, Heidelberg}
}