@InProceedings{ramanath-choudhury-bali:2013:LAW7-ID,
  author    = {Ramanath, Rohan  and  Choudhury, Monojit  and  Bali, Kalika},
  title     = {Entailment: An Effective Metric for Comparing and Evaluating Hierarchical and Non-hierarchical Annotation Schemes},
  booktitle = {Proceedings of the 7th Linguistic Annotation Workshop and Interoperability with Discourse},
  month     = {August},
  year      = {2013},
  address   = {Sofia, Bulgaria},
  publisher = {Association for Computational Linguistics},
  pages     = {42--50},
  url       = {http://www.aclweb.org/anthology/W13-2306}
}