Adding structure to top-k: from items to expansions.

@inproceedings{liang-2011-adding, author = {Xueyao Liang and Min Xie and Laks V. S. Lakshmanan}, editor = {Craig Macdonald and Iadh Ounis and Ian Ruthven}, title = {{Adding structure to top-k: from items to expansions}}, booktitle = {{Proceedings of the 20th ACM Conference on Information and Knowledge Management, CIKM 2011, Glasgow, United Kingdom, October 24-28, 2011}}, pages = {1699--1708}, publisher = {ACM}, year = {2011}, url = {https://doi.org/10.1145/2063576.2063821}, doi = {https://doi.org/10.1145/2063576.2063821} }