Akinobu Miyata Jun Tarui Etsuji Tomita Learning Boolean Functions in AC<sup>0</sup> on Attribute and Classification Noise. 142-155 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3244&spage=142 2004 conf/alt/2004 ALT db/conf/alt/alt2004.html#MiyataTT04