@article{CTT100585255,
  author = {Sugiyama, M. and Kawanabe, M. and Chui, P. L.},
  title = {Dimensionality reduction for density ratio estimation in high-dimensional spaces.},
  journal = {Neural Networks,},
  year = 2010,
}

@inproceedings{CTT100589540,
  author = {Sugiyama, M. and Kawanabe, M. and Chui, P. L.},
  title = {Dimensionality reduction for density ratio estimation in high-dimensional spaces.},
  booktitle = {In Proceeding of The Fourth International Workshop on Data-Maining and Statistical Science(DMSS2009)},
  year = 2009,
}