@inproceedings{SIGIR-2002-Kawatani,
	author        = "Takahiko Kawatani",
	booktitle     = "{Proceedings of the 25th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/564376.564402",
	pages         = "137--144",
	publisher     = "{ACM}",
	title         = "{Topic difference factor extraction between two document sets and its application to text categorization}",
	year          = 2002,
}