visvowref <- bibentry(bibtype = "InCollection",
  year      = "2017",
  author    = "W. Heeringa and H. Van de Velde",
  title     = "Visible Vowels: a Tool for the Visualization of Vowel Variation",
  booktitle = "Proceedings of the 18th Annual Conference of the International Speech Communication Association (Interspeech 2017), August 20-24, 2017, Stockholm, Sweden",
  publisher = "ISCA",
  pages     = "4034-4035",
  note      = "Paper number 2055",
  url       = "http://www.isca-speech.org/archive/Interspeech_2017/pdfs/2055.PDF"
)
