@inproceedings{KDD-2006-IwataSY,
	author        = "Tomoharu Iwata and Kazumi Saito and Takeshi Yamada",
	booktitle     = "{Proceedings of the 12th International Conference on Knowledge Discovery and Data Mining}",
	doi           = "10.1145/1150402.1150470",
	isbn          = "1-59593-339-5",
	pages         = "574--579",
	publisher     = "{ACM}",
	title         = "{Recommendation method for extending subscription periods}",
	year          = 2006,
}