@article{whyisitdifficulttodetectsuddenand,
  title = {Why is it Difficult to Detect Sudden and Unexpected Epidemic Outbreaks in Twitter?},
  author = {Avaré Stewart and Sara Romano and Nattiya Kanhabua and Sergio Di Martino and Wolf Siberski and Antonino Mazzeo and Wolfgang Nejdl and Ernesto Diaz-Aviles},
  year = {2016},
  eprint = {1611.03426},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1611.03426v1},
}