@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}
}