Maristella Agosti Hanne Albrechtsen Nicola Ferro Ingo Frommholz Preben Hansen Nicola Orio Emanuele Panizzi Annelise Mark Pejtersen Ulrich Thiel DiLAS: a Digital Library Annotation Service. 91-101 2005 conf/iwac/2005 IWAC db/conf/iwac/iwac2005.html#AgostiAFFHOPPT05