@inproceedings{buildingalearnercorpus,
  title = {Building a learner corpus},
  author = {Jirka Hana and Alex Rosen and R and Barbora {\v{S}}tindlov{\'a} and Petr J{\"a}ger},
  year = {2012},
  booktitle = {LREC 2012 5},
  url = {https://aclanthology.org/L12-1591},
}