@inbookWrede_Rohlfing_Spexard_Fritsch_2007, title=Towards tutoring an interactive robot, DOI=10.5772/4825, booktitle=Humanoid Robots, Human-like Machines, publisher=ARS, author=Wrede, Britta and Rohlfing, Katharina and Spexard, Thorsten P. and Fritsch, Jannik, editor=Hackel, Matthias, year=2007, pages=601–612