Paolo Coppola Raffaella Lomuscio Stefano Mizzaro Elena Nazzi Luca Vassena Mobile Social Software for Cultural Heritage: A Reference Model. 69-80 2008 BIS (Workshops) http://ceur-ws.org/Vol-333/saw6.pdf conf/bis/2008w db/conf/bis/bisw2008.html#CoppolaLMNV08