@InProceedings{li-EtAl:2015:EMNLP5,
  author    = {Li, Jiwei  and  Luong, Minh-Thang  and  Jurafsky, Dan  and  Hovy, Eduard},
  title     = {When Are Tree Structures Necessary for Deep Learning of Representations?},
  booktitle = {Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing},
  month     = {September},
  year      = {2015},
  address   = {Lisbon, Portugal},
  publisher = {Association for Computational Linguistics},
  pages     = {2304--2314},
  url       = {http://aclweb.org/anthology/D15-1278}
}