In: Wolfgang Narzt; Ann Gordon-Ross (Hrsg.). UBICOMM 2013, The Seventh International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies. International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies (UBICOMM-13), 7th, located at NexTech 2013, September 29 - October 3, Porto, Portugal, Pages 30-37, ISBN 978-1-61208-289-9, IARIA, 9/2013.