P. Vorst, and A. Zell. ISR/ROBOTIK 2010 (Proceedings of the joint conference of ISR 2010 (41st International Symposium on Robotics) and ROBOTIK 2010 (6th German Conference on Robotics)), page 354--361. VDE Verlag, (June 2010)
A. Möller, M. Kranz, R. Huitl, S. Diewald, and L. Roalter. Proceedings of the 11th International Conference on Mobile and Ubiquitous Multimedia, page 4:1--4:10. New York, NY, USA, ACM, (2012)
F. Li, C. Zhao, G. Ding, J. Gong, C. Liu, and F. Zhao. Proceedings of the 2012 ACM Conference on Ubiquitous Computing, page 421--430. New York, NY, USA, ACM, (2012)
V. Otsason, A. Varshavsky, A. LaMarca, and E. de Lara. UbiComp 2005: Ubiquitous Computing, volume 3660 of Lecture Notes in Computer Science, Springer Berlin / Heidelberg, 10.1007/11551201_9.(2005)