Interactive Multimodal User Interfaces for Mobile Devices
W. Müller, R. Schäfer, S. Bleul, in: Proceedings of HICCS-37, Waikoloa, HI, USA, 2004.

VIPspace - A Visually Programmable Shared Workspace
M. Dücker, W. Müller, J. Rubart, in:  Proceedings. 1998 IEEE Symposium on Visual Languages , Halifax, NS, Canada , 1998.