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3. Vowel contrast reduction. An acoustic and perceptual study of Dutch vowels in various speech conditions;Koopmans-Van Beinum,1980
4. Spectro-temporal reduction and expansion in spontaneous speech and read text: The role of focus words;Koopmans-Van Beinum,1990
5. A peak-and-level model for focus words in read and spontaneous natural speech and in synthetic speech;Koopmans-Van Beinum,1991