Tomonari Masada Atsuhiro Takasu Tsuyoshi Hamada Yuichiro Shibata Kiyoshi Oguri Bag of Timestamps: A Simple and Efficient Bayesian Chronological Mining. 556-561 2009 APWeb/WAIM http://dx.doi.org/10.1007/978-3-642-00672-2_51 conf/waim/2009 db/conf/waim/waim2009.html#MasadaTHSO09