M. Maifarth, J. Griesbaum, and R. Kölle. E-Learning zwischen Vision und Alltag, Medien in der Wissenschaft, 64, page 332-337. Münster, New York, München,Berlin, Waxmann, (2013)
J. Sánchez Prieto, S. Miguelá\ nez, and F. Garc\'ıa-Pe\ nalvo. Proceedings of the First International Conference on Technological Ecosystem for Enhancing Multiculturality, page 473--480. New York, NY, USA, ACM, (2013)