@article{Xu-EtAl:2015:TACL,
  author = {Wei Xu and Chris Callison-Burch and Courtney Napoles},
  title = {Problems in Current Text Simplification Research: New Data Can
Help},
  journal = {Transactions of the Association for Computational Linguistics},
  volume = {3},
  year = {2015},
  url = {http://www.cis.upenn.edu/~ccb/publications/publications/new-data-for-text-simplification.pdf},
  pages = {283--297}
}