Which ostensive stimuli can be used for a robot to detect and maintain tutoring situations?

Katrin S. Lohan, Anna-Lisa Vollmer, Jannik Fritsch, Katharina J. Rohlfing, Britta Wrede. Which ostensive stimuli can be used for a robot to detect and maintain tutoring situations?. In Affective Computing and Intelligent Interaction, Third International Conference and Workshops, ACII 2009, Amsterdam, The Netherlands, September 10-12, 2009, Proceedings. pages 1-6, IEEE, 2009. [doi]

@inproceedings{LohanVFRW09,
  title = {Which ostensive stimuli can be used for a robot to detect and maintain tutoring situations?},
  author = {Katrin S. Lohan and Anna-Lisa Vollmer and Jannik Fritsch and Katharina J. Rohlfing and Britta Wrede},
  year = {2009},
  doi = {10.1109/ACII.2009.5349507},
  url = {http://dx.doi.org/10.1109/ACII.2009.5349507},
  researchr = {https://researchr.org/publication/LohanVFRW09},
  cites = {0},
  citedby = {0},
  pages = {1-6},
  booktitle = {Affective Computing and Intelligent Interaction, Third International Conference and Workshops, ACII 2009, Amsterdam, The Netherlands, September 10-12, 2009, Proceedings},
  publisher = {IEEE},
}