Jerzy Blaszczynski Jerzy Stefanowski Magdalena Zajac Ensembles of Abstaining Classifiers Based on Rule Sets. 382-391 2009 ISMIS http://dx.doi.org/10.1007/978-3-642-04125-9_41 conf/ismis/2009 db/conf/ismis/ismis2009.html#BlaszczynskiSZ09