@inproceedings{carreras2004conllb,
   author = "Xavier Carreras, Llu{\'\i}s M{\`a}rquez and Grzegorz Chrupala,
   title = "Hierarchical Recognition of Propositional Arguments with Perceptrons",
   booktitle = "Proceedings of CoNLL-2004",
   editors = "Hwee Tou Ng and Ellen Riloff",
   publisher = "Boston, MA, USA",
   year = "2004",
   pages = "106--09"
}