<XML><RECORDS><RECORD><REFERENCE_TYPE>1</REFERENCE_TYPE><REFNUM>6881</REFNUM><AUTHORS><AUTHOR>van Rijsbergen,C.J.</AUTHOR></AUTHORS><YEAR>1979</YEAR><TITLE>Information retrieval, Second edition</TITLE><PLACE_PUBLISHED> </PLACE_PUBLISHED><PUBLISHER>Butterworths</PUBLISHER><LABEL>van Rijsbergen:1979:6881</LABEL><ABSTRACT> </ABSTRACT></RECORD></RECORDS></XML>