Wolf Kienzle Gökhan H. Bakir Matthias O. Franz Bernhard Schölkopf Efficient Approximations for Support Vector Machines in Object Detection. 54-61 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3175&spage=54 2004 conf/dagm/2004 DAGM-Symposium db/conf/dagm/dagm2004.html#KienzleBFS04