@inproceedings{JonesSHC09, author = {Jones, Timothy and Sankaranarayana, Ramesh and Hawking, David and Craswell, Nick}, title = {Nullification test collections for web spam and SEO}, booktitle = {AIRWeb 2009: Proceedings of the 5th International Workshop on Adversarial Information Retrieval on the Web}, year = {2009}, isbn = {978-1-60558-438-6}, pages = {53--60}, location = {Madrid, Spain}, ee = {https://doi.acm.org/10.1145/1531914.1531927}, publisher = {ACM}, address = {New York, NY, USA}, note = {\url{https://david-hawking.net/pubs/p53-jones.pdf}} }