Ad hoc IR: not much room for improvement.

@inproceedings{trotman-2011-ad, author = {Andrew Trotman and David Keeler}, editor = {Wei-Ying Ma and Jian-Yun Nie and Ricardo Baeza-Yates and Tat-Seng Chua and W. Bruce Croft}, title = {{Ad hoc IR: not much room for improvement}}, booktitle = {{Proceeding of the 34th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2011, Beijing, China, July 25-29, 2011}}, pages = {1095--1096}, publisher = {ACM}, year = {2011}, url = {https://doi.org/10.1145/2009916.2010066}, doi = {https://doi.org/10.1145/2009916.2010066} }