Magnus Nordstrand Gunilla Svanfeldt Björn Granström David House Measurements of articulatory variation in expressive speech for a set of Swedish vowels. 187-196 2004 44 Speech Communication 1-4 http://dx.doi.org/10.1016/j.specom.2004.09.003 db/journals/speech/speech44.html#NordstrandSGH04