Andreas Birkendorf Eli Dichterman Jeffrey C. Jackson Norbert Klasner Hans-Ulrich Simon On Restricted-Focus-of-Attention Learnability of Boolean Functions. 205-216 1996 COLT http://doi.acm.org/10.1145/238061.238098 db/conf/colt/colt1996.html#BirkendorfDJKS96