@misc{sto-99-voytk,
  author = {Jorge Stolfi},
  title = {The Voynich Manuscript},
  url = {https://www.ic.unicamp.br/~stolfi/EXPORT/papers/by-tag/sto-99-voytk.ps.gz},
  howpublished = {Talk presented at the Special Session on Combinatorics of the 22nd Brazilian Mathematics Colloquium, IMPA, Rio de Janeiro. Transparencies avaliable},
  year = 1999,
  month = jul
}