Rosen-Zvi, M., Griffiths, T., Steyvers, M., Smyth, P., {The author-topic model for authors and documents} (2004), S. 487--494.
Steyvers, M., Smyth, P., Rosen-Zvi, M., Griffiths, T.: Probabilistic Author-Topic models for information discovery. In: The Tenth ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, 2004