Tracking trends: incorporating term volume into temporal topic models..
In: C. Apté, J. Ghosh and P. Smyth, editors, KDD, pages 484-492. ACM, 2011.
Liangjie Hong, Dawei Yin, Jian Guo 0002 and Brian D. Davison 0001.
[doi]  [BibTeX] 

Temporal Dynamics of On-Line Information Streams.
2006.
J. Kleinberg.
[doi]  [BibTeX] 

Finding scientific topics.
, 2004.
Thomas L. Griffiths and Mark Steyvers.
[doi]  [BibTeX]