<XML><RECORDS><RECORD><REFERENCE_TYPE>0</REFERENCE_TYPE><REFNUM>6883</REFNUM><AUTHORS><AUTHOR>Harper,D.J.</AUTHOR><AUTHOR>van Rijsbergen,C.J.</AUTHOR></AUTHORS><YEAR>1978</YEAR><TITLE>An evaluation of feedback in document retrieval using co-occurrence data</TITLE><PLACE_PUBLISHED>Journal of Documentation, 34 </PLACE_PUBLISHED><PUBLISHER>N/A</PUBLISHER><PAGES>189-216</PAGES><LABEL>Harper:1978:6883</LABEL><ABSTRACT> </ABSTRACT></RECORD></RECORDS></XML>