Spectral classification of phonemes by learning subspaces. - Teuvo Kohonen; Gábor Németh; Kalle-J. Bry; Matti Jalanko; Heikki Riittinen (ICASSP, 1979)

Experiments on an isolated-word recognition system for multiple speakers. - Heikki Riittinen; Seppo Haltsonen; Erkki Reuhkala; Matti Jalanko (ICASSP, 1981)

The on-line version of the Otaniemi speech recognition system. - Erkki Reuhkala; Heikki Riittinen; Seppo Haltsonen; Olli Ventä; Kai Makisara; Teuvo Kohonen (ICASSP, 1982)

Short-cut algorithms for the learning subspace method. - Heikki Riittinen (ICASSP, 1984)

On-line recognition of spoken words from a large vocabulary. - Teuvo Kohonen; Heikki Riittinen; Erkki Reuhkala; Seppo Haltsonen (Inf. Sci., 1984)

A microprocessor-based word recognition system for large vocabularies. - Kari Torkkola; Heikki Riittinen (ICASSP, 1986)