]> Ricardo Baeza-Yates Web 2009-11-15T05:30:00+08:00 Search Retrieval 65 2009-12-22T23:30:00+08:00 7.81 2010-01-17T13:30:00+08:00 P9Y 2010-01-17T05:30:00+08:00 P10Y 2010-01-10T03:15:00+08:00