@misc{indiciae7f4df666d7d5,
  title = {Methods of computing vocabulary size for the two-parameter rank distribution},
  author = {Edmundson, H. P. and Fostel, G. and Tung, I. and Underwood, W.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730004470},
  note = {Source identifier: 19730004470}
}