@Inproceedings{EPTCS31.18,
  author    = {Piao, Xiaoxue and Salomaa, Kai},
  year      = {2010},
  title     = {Transformations Between Different Types of Unranked Bottom-Up Tree Automata},
  editor    = {McQuillan, Ian and Pighizzini, Giovanni},
  booktitle = {{\rm Proceedings Twelfth Annual Workshop on}
               Descriptional Complexity of Formal Systems,
               {\rm Saskatoon, Canada, 8-10th August 2010}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {31},
  publisher = {Open Publishing Association},
  pages     = {159-168},
  doi       = {10.4204/EPTCS.31.18},
}