N. Pattan, and D. Madamanchi. Mobile Computing, Applications, and Services, volume 35 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, Springer Berlin Heidelberg, 10.1007/978-3-642-12607-9_21.(2010)
B. Ringbauer, R. Kniewel, and C. Hipp. Usability Professionals 2009 : Berichtband des siebten Workshops des German Chapters der Usability Professionals Association e.V, 06.09.-09.09.2009 an der Humboldt-Universität zu Berlin, page 18-22. Stuttgart, Fraunhofer IRB Verlag, (2009)
L. Aalto, N. Göthlin, J. Korhonen, and T. Ojala. MobiSys '04: Proceedings of the 2nd international conference on Mobile systems, applications, and services, page 49--58. New York, NY, USA, ACM Press, (2004)
M. Khan. University of Kassel, Fachbereich 16: Elektrotechnik/Informatik, Distributed Systems Group, Wilhelmshöher Allee 73, 34121 Kassel, Germany, (March 2010)