<XML><RECORDS><RECORD><REFERENCE_TYPE>7</REFERENCE_TYPE><REFNUM>6882</REFNUM><AUTHORS><AUTHOR>van Rijsbergen,C.J.</AUTHOR></AUTHORS><YEAR>1979</YEAR><TITLE>Retrieval effectiveness</TITLE><PLACE_PUBLISHED> </PLACE_PUBLISHED><PUBLISHER>Ablex Publishing Corporation, New Jersey, U.S.A.</PUBLISHER><PAGES>91-118</PAGES><LABEL>van Rijsbergen:1979:6882</LABEL><ABSTRACT> </ABSTRACT></RECORD></RECORDS></XML>