Designing digital artifacts as transient assemblies with different digital materialities. - Demosthenes Akoumianakis; Nikolas Karadimitriou; Dimitrios Kotsalis; George Ktistakis; Costas Michailidis; Efthymios Syntychakis; George Vellis; Nikolaos Vidakis; George Vlachakis (Panhellenic Conference on Informatics, 2015)