Use of computational psychoacoustical models in speech processing: Coding and objective performance evaluation. - J. Koljonen; Matti Karjalainen (ICASSP, 1984)

Supraglottal acoustics and vowel intrinsic fundamental frequency; An experimental study. - Erkki Vilkman; Unto K. Laine; J. Koljonen (Speech Commun., 1991)