Multi-level clustering of acoustic features for phoneme recognition based on mutual information. - Katsuhiko Shirai; Noriyuki Aoki; Naoki Hosaka (ICASSP, 1989)

Phoneme recognition in continuous speech using feature selection based on mutual information. - Katsuhiko Shirai; Noriyuki Aoki; Naoki Hosaka (EUROSPEECH, 1989)