iVOLUNTEER: a digital ecosystem for life-long volunteering. - Elisabeth Kapsammer; Eugen Kimmerstorfer; Birgit Pröll; Werner Retschitzegger; Wieland Schwinger; Johannes Schönböck; Nikolaus Dürk; Gustavo Rossi; Silvia E. Gordillo (iiWAS, 2017)