D. Preuveneers, and Y. Berbers. MobileHCI '08: Proceedings of the 10th international conference on Human computer interaction with mobile devices and services, page 177--186. New York, NY, USA, ACM, (2008)
A. Holzer, and J. Ondrus. Mobile Wireless Middleware, Operating Systems, and Applications - Workshops, volume 12 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, Springer Berlin Heidelberg, (2009)
V. Rivera-Pelayo, J. Munk, V. Zacharias, and S. Braun. Proceedings of the Third International Conference on Learning Analytics and Knowledge, page 23–27. New York, NY, USA, Association for Computing Machinery, (2013)