@inproceedings{2005RelativePositioning,
 author = {Mike Hazas and Christian Kray and Hans Gellersen and Henoc Agbota and Gerd Kortuem and Albert Krohn},
 title = {A relative positioning system for co-located mobile devices},
 booktitle = {MobiSys '05: Proceedings of the 3rd international conference on Mobile systems, applications, and services},
 year = {2005},
 isbn = {1-931971-31-5},
 pages = {177--190},
 location = {Seattle, Washington},
 doi = {http://doi.acm.org/10.1145/1067170.1067190},
 publisher = {ACM Press},
 address = {New York, NY, USA},
 }