Efficient phrase querying with flat position index.

@inproceedings{shan-2011-efficient, author = {Dongdong Shan and Wayne Xin Zhao and Jing He and Rui Yan and Hongfei Yan and Xiaoming Li}, editor = {Craig Macdonald and Iadh Ounis and Ian Ruthven}, title = {{Efficient phrase querying with flat position index}}, booktitle = {{Proceedings of the 20th ACM Conference on Information and Knowledge Management, CIKM 2011, Glasgow, United Kingdom, October 24-28, 2011}}, pages = {2001--2004}, publisher = {ACM}, year = {2011}, url = {https://doi.org/10.1145/2063576.2063875}, doi = {https://doi.org/10.1145/2063576.2063875} }