Andrew Koster Jordi Madrenas-Ciurana Nardine Osman 0001 W. Marco Schorlemmer Jordi Sabater-Mir Carles Sierra Angela Fabregues Dave de Jonge Josep Puyol-Gruart Pere Garcia-Calvés u-Help: supporting helpful communities with information technology. 1109-1110 2013 AAMAS http://dl.acm.org/citation.cfm?id=2485095 conf/atal/2013 db/conf/atal/aamas2013.html#KosterMOSSSFJPG13