@InCollection{CraswellH09, author = {Nick Craswell and David Hawking}, title = {Web Information Retrieval}, booktitle = {Information Retrieval: Searching in the 21st Century}, pages = {85--101}, year = 2009, publisher = {Wiley}, address = {UK}, editor = {Ayse G\"{o}ker and John Davies}, note = {\url{https://david-hawking.net/pubs/craswell-hawking_09_chapter.pdf}} }