Guo, Zhen, Shenghuo Zhu, Zhongfei Zhang, Yun Chi, and Yihong Gong. 2010. “A Topic Model for Linked Documents and Update Rules for Its Estimation”. Proceedings of the AAAI Conference on Artificial Intelligence 24 (1):463-68. https://doi.org/10.1609/aaai.v24i1.7687.