@article{JMLR:v10:bickel09a,
  author  = {Steffen Bickel and Michael Br{{\"u}}ckner and Tobias Scheffer},
  title   = {Discriminative Learning Under Covariate Shift},
  journal = {Journal of Machine Learning Research},
  year    = {2009},
  volume  = {10},
  number  = {75},
  pages   = {2137--2155},
  url     = {http://jmlr.org/papers/v10/bickel09a.html}
}