English, Portuguese, and Spanish vowels are discussed, and possible errors of Portuguese-speaking students of English are examined. http://www.sk.com.br/sk-voga.html
Experiments concerning the physical characteristics of vowels: formants and pitches (F0), formant pattern ambiguity, formant number alteration. Important for all sciences related to speech, acoutsic phonetics, speech therapy and speech recognition. http://www.unizh.ch/neurol/psychologie/associates/maurer/vowels/index.htm
Contributed-content index of Optimality Theory information. Searchable or browseable data, submission and update forms, font and utility downloads, links to other collections. http://roa.rutgers.edu/
Contains speech samples illustrating the phonetic diversity of non-lexical items in conversation, such as uh-huh, mm-hm, nn-hnn, nyeah, m-kay, together with discussion of their pragmatics. http://nigelward.com/egrunts/