In: L. Seabra Lopes; T. Belpaeme; S.J. Cowley (Hrsg.). Language and Robots: Proceedings of the Symposium. Symposium on Language and Robots (LangRo-07), December 10-12, Aveiro, Portugal, Pages 101-106, ISBN 978-972-96895-2-9, Universidade de Aveiro, Portugal, 12/2007.