Nicolò Cesa-Bianchi Alex Conconi Claudio Gentile A Second-Order Perceptron Algorithm. 121-137 2002 conf/colt/2002 COLT http://link.springer.de/link/service/series/0558/bibs/2375/23750121.htm db/conf/colt/colt2002.html#Cesa-BianchiCG02