@article{HawkingZ07, author = {David Hawking and Justin Zobel}, title = {Does Topic Metadata Help with Web Search?}, journal = {JASIST}, year = {2007}, volume = {58}, number = {5}, pages = {613-628}, note = {Preprint at \url{https://david-hawking.net/pubs/hawking_zobel_jasist.pdf}} }