Tim Mansfield Nigel Ward Markus Rittenbruch Gregor McEwan José Siqueira Anthony Wilkinson Sharing Social Recommendations: Towards a Social Portal. 240-251 2002 conf/dcw/2002 DCW http://link.springer.de/link/service/series/0558/bibs/2468/24680240.htm db/conf/dcw/dcw2002.html#MansfieldWRMSW02