Levent Bolelli Seyda Ertekin C. Lee Giles Topic and Trend Detection in Text Collections Using Latent Dirichlet Allocation. 776-780 2009 ECIR http://dx.doi.org/10.1007/978-3-642-00958-7_84 conf/ecir/2009 db/conf/ecir/ecir2009.html#BolelliEG09