@misc{indiciae9e9a1118b0b8,
  title = {Harmonic levels and vowel roughness.},
  author = {F W Emanuel and R L Whitehead},
  year = {1979},
  doi = {10.1044/jshr.2204.829},
  url = {https://pubmed.ncbi.nlm.nih.gov/513690/},
  note = {Source identifier: 513690}
}