Yusuke Matsushita Toshikazu Wada Principal Component Hashing: An Accelerated Approximate Nearest Neighbor Search. 374-385 2009 PSIVT http://dx.doi.org/10.1007/978-3-540-92957-4_33 conf/psivt/2009 db/conf/psivt/psivt2009.html#MatsushitaW09