Fred Voorhorst

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Fjeld, Morten, Zuberbuhler, Hans-Jorg, Guttormsen, Sissel, Voorhorst, Fred, Krueger, Helmut (2003): Towards Guidelines for Touch Screen Design: Perception of Button Form and Extension. In: Proceedings of IFIP INTERACT03: Human-Computer Interaction , 2003, Zurich, Switzerland. pp. 757.

Fjeld, Morten, Lauche, Kristina, Bichsel, Martin, Voorhorst, Fred, Krueger, Helmut, Rauterberg, Matthias (2002): Physical and Virtual Tools: Activity Theory Applied to the Design of Groupware. In Computer Supported Cooperative Work, 11 (1) pp. 153-180.

Fjeld, Morten, Voorhorst, Fred, Bichsel, Martin, Lauche, Kristina, Rauterberg, Matthias, Krueger, Helmut (1999): Exploring Brick-Based Navigation and Composition in an Augmented Reality. In: Gellersen, Hans-Werner (eds.) Handheld and Ubiquitous Computing - First International Symposium - HUC99 September 27-29, 1999, Karlsruhe, Germany. pp. 102-116.

Voorhorst, Fred, Krueger, Helmut (1999): User-friendly by making the interface graspable. In: Bullinger, Hans-Jorg (eds.) HCI International 1999 - Proceedings of the 8th International Conference on Human-Computer Interaction August 22-26, 1999, Munich, Germany. pp. 416-420.