Collaborative, Trusted and Privacy-Aware e/m-Services 12th IFIP WG 6.11 Conference on e-Business, e-Services, and e-Society, I3E 2013, Athens, Greece, April 25-26, 2013. Proceedings - Douligeris, Christos; Polemi, Nineta; Karantjias, Athanasios; Lamersdorf, Winfried (Springer Berlin Heidelberg : Imprint: Springer, 2013)