@inproceedings{ICPR-2012-UchidaTS,
	author        = "Yusuke Uchida and Koichi Takagi and Shigeyuki Sakazawa",
	booktitle     = "{Proceedings of the 21st International Conference on Pattern Recognition}",
	isbn          = "978-1-4673-2216-4",
	pages         = "1285--1288",
	publisher     = "{IEEE Computer Society}",
	title         = "{An alternative to IDF: Effective scoring for accurate image retrieval with non-parametric density ratio estimation}",
	year          = 2012,
}