Naoki Tadokoro Tetsuo Kosaka Masaharu Katoh Masaki Kohda Improvement of Speaker Vector-Based Speaker Verification. 721-724 2009 IAS http://dx.doi.org/10.1109/IAS.2009.162 conf/IEEEias/2009 db/conf/IEEEias/IEEEias2009.html#TadokoroKKK09