@book{rijsbergen79ir,
	title = {Information retrieval},
	address = {London},
	author = {C. J. van Rijsbergen},
	edition = {2},
	publisher = {Butterworths},
	url = {http://www.dcs.glasgow.ac.uk/Keith/Preface.html},
	year = {1979},
	biburl = {http://www.bibsonomy.org/bibtex/2b53893655b48140d4310a848dbf204d3/wnpxrz},
	keywords = {ir }
}