On the use of phase information-based joint factor analysis for speaker verification under channel mismatch condition. - Ikuya Hirano; Longbiao Wang; Atsuhiko Kai; Seiichi Nakagawa (APSIPA, 2012)

Single-sided approach to discriminative PLDA training for text-independent speaker verification without using expanded i-vector. - Ikuya Hirano; Kong-Aik Lee; Zhaofeng Zhang; Longbiao Wang; Atsuhiko Kai (ISCSLP, 2014)