The importance of spectral quality of vowels for the intelligibility of sentences. - Gitta P. M. Laan; Dick R. van Bergem; Florien J. Koopmans-van Beinum (EUROSPEECH, 1991)

The contribution of pitch contour, phoneme durations and spectral features to the character of spontaneous and read aloud speech. - Gitta P. M. Laan; Dick R. van Bergem (EUROSPEECH, 1993)

The contribution of intonation, segmental durations, and spectral features to the perception of a spontaneous and a read speaking style. - Gitta P. M. Laan (Speech Commun., 1997)