Zahid Riaz Christoph Mayer Matthias Wimmer Michael Beetz Bernd Radig A Model Based Approach for Expressions Invariant Face Recognition. 289-298 2009 ICB http://dx.doi.org/10.1007/978-3-642-01793-3_30 conf/icb/2009 db/conf/icb/icb2009.html#RiazMWBR09