Zahid Riaz Christoph Mayer Michael Beetz Bernd Radig Model Based Analysis of Face Images for Facial Feature Extraction. 99-106 2009 CAIP http://dx.doi.org/10.1007/978-3-642-03767-2_12 conf/caip/2009 db/conf/caip/caip2009.html#RiazMBR09