Avrim Blum Roni Khardon Eyal Kushilevitz Leonard Pitt Dan Roth On Learning Read-<i>k</i>-Satisfy-<i>j</i> DNF. 110-117 1994 COLT http://doi.acm.org/10.1145/180139.181051 db/conf/colt/colt1994.html#BlumKKPR94