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with Bartneck, C. (2007)., Hci and the face: towards an art of the soluble, in J. Jacko (ed.), Human-computer interaction. Interaction design and usability, Dordrecht, Springer, pp. 20-29.

with van Tonder, G. J. (2005). Visual perception in Japanese rock garden design. Axiomathes 15 (3), pp. 353-371.