Martin Ebner, Christian Stickel, Nick Scerbakov, Andreas Holzinger. A Study on the Compatibility of Ubiquitous Learning (u-Learning) Systems at University Level. In Constantine Stephanidis, editor, Universal Access in Human-Computer Interaction. Applications and Services, 5th International Conference, UAHCI 2009, Held as Part of HCI International 2009, San Diego, CA, USA, July 19-24, 2009. Proceedings, Part III. Volume 5616 of Lecture Notes in Computer Science, pages 34-43, Springer, 2009. [doi]