@InProceedings{VanDerGrinten-HFR-2019,
  author    = {van der Grinten, Tim and Mueller, {\relax St}effen and Westhoven, Martin and Wischniewski, Sascha and Scheidig, Andrea and Gross, Horst Michael},
  title     = {Designing an Expressive Head For a Help Requesting Socially Assistive Robot},
  booktitle = {Human-Friendly Robotics (HFR), Springer Proceedings in Advanced Robotics vol.12},
  year      = {2019},
  pages     = {88--102},
  publisher     = {Springer},
}