@inproceedings{investigatingopinionminingthroughlanguag,
  title = {Investigating Opinion Mining through Language Varieties: a Case Study of Brazilian and European Portuguese tweets},
  author = {Douglas Vit{\'o}rio and Ellen Polliana Ramos Souza and Ingryd Pereira and Adriano Oliveira},
  year = {2017},
  booktitle = {WS 2017 10},
  url = {https://aclanthology.org/W17-6607},
}