Zahid Riaz Christoph Mayer Michael Beetz Bernd Radig Facial Expressions Recognition from Image Sequences. 315-323 2008 COST 2102 Conference (Prague) http://dx.doi.org/10.1007/978-3-642-03320-9_29 conf/cost/2008p db/conf/cost/cost2008p.html#RiazMBR08