Jussi Kujala Timo Aho Tapio Elomaa A Walk from 2-Norm SVM to 1-Norm SVM. 836-841 2009 ICDM http://doi.ieeecomputersociety.org/10.1109/ICDM.2009.100 conf/icdm/2009 db/conf/icdm/icdm2009.html#KujalaAE09