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Mark Steyvers Padhraic Smyth Michal Rosen-Zvi Thomas L. Griffiths Probabilistic author-topic models for information discovery. 306-315 2004 conf/kdd/2004 KDD http://doi.acm.org/10.1145/1014052.1014087 db/conf/kdd/kdd2004.html#SteyversSRG04