Vicent Estruch César Ferri José Hernández-Orallo M. José Ramírez-Quintana Beam Search Extraction and Forgetting Strategies on Shared Ensembles. 206-216 2003 conf/mcs/2003 Multiple Classifier Systems http://link.springer.de/link/service/series/0558/bibs/2709/27090206.htm db/conf/mcs/mcs2003.html#EstruchFHR03