@article{CTT100660147,
  author = {Khan, R.R. and Sugiyama, M.},
  title = {Semi-supervised leasst-squares conditional density estimation},
  journal = {International Jounal of Scientific Engineering and Technology},
  year = 2013,
}

@inproceedings{CTT100660117,
  author = {Khan, R.R. and Sugiyama, M.},
  title = {Least squares conditional density estimation in semi-supervised learning settings},
  booktitle = {},
  year = 2012,
}