Akinori Kawachi Tomoyuki Yamakami Quantum Hardcore Functions by Complexity-Theoretical Quantum List Decoding. 216-227 2006 conf/icalp/2006-2 ICALP (2) http://dx.doi.org/10.1007/11787006_19 db/conf/icalp/icalp2006-2.html#KawachiY06