Terje Gjøsæter Jan Pettersen Nytun Andreas Prinz Mikael Snaprud Merete Skjelten Tveit Modelling Accessibility Constraints. 40-47 2006 conf/icchp/2006 ICCHP http://dx.doi.org/10.1007/11788713_7 db/conf/icchp/icchp2006.html#GjosaeterNPST06