Julien Prados Alexandros Kalousis Melanie Hilario Feature Selection with the logRatio Kernel. 177-187 2008 SDM http://www.siam.org/proceedings/datamining/2008/dm08_16_prados_kalousis_hilario.pdf conf/sdm/2008 db/conf/sdm/sdm2008.html#PradosKH08