@inproceedings{krymolowski2002conll,
   author     = "Yuval Krymolowski",
   title      = "Distinguishing easy and hard instances",
   booktitle  = "Proceedings of CoNLL-2002",
   editors    = "Dan Roth and Antal van den Bosch",
   publisher  = "Taipei, Taiwan",
   pages      = "43--48",
   year       = "2002"
}