@misc{sto-13-bitcoin-blog,
  author = {Jorge Stolfi},
  title = {Cuidado com Bitcoin!},
  url = {https://advivo.com.br/blog/cuidado-com-bitcoin/},
  howpublished = {Online document at the Advivo.com.br website},
  year = 2013,
  month = dec,
  language = {portuguese}
}