@inproceedings{dondrup2014hesitation,
  title={Hesitation signals in human-robot head-on encounters: a pilot study},
  author={Dondrup, Christian and Lichtenth{\"a}ler, Christina and Hanheide, Marc},
  booktitle={Proceedings of the 2014 ACM/IEEE international conference on Human-robot interaction},
  pages={154--155},
  year={2014},
  organization={ACM}
}