@inproceedingsLohan_Vollmer_Fritsch_Rohlfing_Wrede_2009, title=Which ostensive stimuli can be used for a robot to detect and maintain tutoring situations?, DOI=10.1109/acii.2009.5349507, booktitle=IEEE International Workshop on Social Signal Processing, publisher=International Computer Science Institute, author=Lohan, Katrin Solveig and Vollmer, Anna-Lisa and Fritsch, Jannik and Rohlfing, Katharina and Wrede, Britta, year=2009