Cliff McKnight Jack Meadows Fytton Rowland H. Woodwardt C. Pritchett User Studies of Commercial and Free Electronic Journals. 1997 ELPUB http://urn.kb.se/resolve?urn=urn:nbn:se:elpub-97109 conf/elpub/1997 db/conf/elpub/elpub1997.html#McKnightMRWP97