Akinori Kawachi Tomoyuki Yamakami Quantum Hardcore Functions by Complexity-Theoretical Quantum List Decoding. 2006 13 Electronic Colloquium on Computational Complexity (ECCC) http://eccc.hpi-web.de/eccc-reports/2006/TR06-020/index.html 020 db/journals/eccc/eccc13.html#KawachiY06