Vicent Estruch César Ferri José Hernández-Orallo M. José Ramírez-Quintana 156-171 2003 conf/mldm/2003 MLDM http://link.springer.de/link/service/series/0558/bibs/2734/27340156.htm db/conf/mldm/mldm2003.html#EstruchFHR03