@inproceedings{featureengineeringforsecondlanguage,
  title = {Feature Engineering for Second Language Acquisition Modeling},
  author = {Guanliang Chen and Claudia Hauff and Geert-Jan Houben},
  year = {2018},
  booktitle = {WS 2018 6},
  url = {https://aclanthology.org/W18-0543},
}