Jan Meskens Jo Vermeulen Kris Luyten Karin Coninx Gummy for multi-platform user interface designs: shape me, multiply me, fix me, use me. 233-240 2008 AVI http://doi.acm.org/10.1145/1385569.1385607 conf/avi/2008 db/conf/avi/avi2008.html#MeskensVLC08