@inproceedings{takamura2004conll,
   author = "Hiroya Takamura and Yuji Matsumoto and Hiroyasu Yamada",
   title = "Modeling Category Structures with a Kernel Function",
   booktitle = "Proceedings of CoNLL-2004",
   editors = "Hwee Tou Ng and Ellen Riloff",
   publisher = "Boston, MA, USA",
   year = "2004",
   pages = "57--64"
}