Peter Brandl Michael Haller Michael Hurnaus Verena Lugmayr Juergen Oberngruber Claudia Oster Christian Schafleitner Mark Billinghurst An Adaptable Rear-Projection Screen Using Digital Pens And Hand Gestures. 49-54 2007 conf/icat/2007 ICAT http://doi.ieeecomputersociety.org/10.1109/ICAT.2007.16 db/conf/icat/icat2007.html#BrandlHHLOOSB07