@inproceedings{azarbonyad2017hitr, title={Hierarchical Re-estimation of Topic Models for Measuring Topical Diversity}, author={Hosein Azarbonyad and Mostafa Dehghani and Tom Kenter and Maarten Marx and Jaap Kamps and Maarten de Rijke}, booktitle={Proceedings of 39th European Conference on Information Retrieval (ECIR 2017)}, year={2017}, webpdf={https://arxiv.org/pdf/1701.04273.pdf} }