@inproceedings{chen-meurers-2017-challenging,
    title = "Challenging learners in their individual zone of proximal development using pedagogic developmental benchmarks of syntactic complexity",
    author = "Chen, Xiaobin  and
      Meurers, Detmar",
    editor = {Volodina, Elena  and
      Grigonyt{\.{e}}, Gintar{\.{e}}  and
      Pil{\'a}n, Ildik{\'o}  and
      Bj{\"o}rkenstam, Kristina Nilsson  and
      Borin, Lars},
    booktitle = "Proceedings of the joint workshop on {NLP} for Computer Assisted Language Learning and {NLP} for Language Acquisition",
    month = may,
    year = "2017",
    address = "Gothenburg, Sweden",
    publisher = "LiU Electronic Press",
    url = "https://preview.aclanthology.org/ingest-emnlp/W17-0302/",
    pages = "8--17"
}