Nicolò Cesa-Bianchi Gábor Lugosi Gilles Stoltz Minimizing Regret with Label Efficient Prediction. 77-92 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3120&spage=77 2004 conf/colt/2004 COLT db/conf/colt/colt2004.html#Cesa-BianchiLS04