@article{weko_17119_1, author = "岩田,具治 and 斉藤,和巳 and 山田,武士", title = "契約期間を延ばすためのレコメンド法", journal = "情報処理学会論文誌数理モデル化と応用(TOM)", year = "2007", volume = "48", number = "SIG6(TOM17)", pages = "65--74", month = "mar" }