@misc{W2104094955,
  author = {Shai Ben-David and John Blitzer and Koby Crammer and Alex Kulesza and Fernando Pereira and Jennifer Wortman Vaughan},
  title = {A theory of learning from different domains},
  year = {2009},
  howpublished = {Machine Learning},
  doi = {https://doi.org/10.1007/s10994-009-5152-4}
}