Martin Memmel, Martin Wolpers, Massimiliano Condotta, Katja Niemann, Rafael Schirru. Introducing a Social Backbone to Support Access to Digital Resources. In Martin Wolpers, Paul A. Kirschner, Maren Scheffel, Stefanie N. Lindstaedt, Vania Dimitrova, editors, Sustaining TEL: From Innovation to Learning and Practice - 5th European Conference on Technology Enhanced Learning, EC-TEL 2010, Barcelona, Spain, September 28 - October 1, 2010. Proceedings. Volume 6383 of Lecture Notes in Computer Science, pages 560-565, Springer, 2010. [doi]