Improving short-time speech frame recognition results by using context. - Kari Torkkola; Mikko Kokkonen; Mikko Kurimo; Pekka Utela (EUROSPEECH, 1991)

Using phoneme group specific LVQ-codebooks with HMMs. - Pekka Utela; Samuel Kaski; Kari Torkkola (ICSLP, 1992)