@inproceedings{Furche2012OPAL,
  title = "OPAL: automated form understanding for the deep web",
  author = "Tim Furche and Georg Gottlob and Giovanni Grasso and Xiaonan Guo and Giorgio Orsi and Christian Schallhart",
  year = "2012",
  booktitle = "WWW",
  pages = "829-838",
}