@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}}
 }