@article{TUW-120324,
author = {Retscher, G{\"u}nther and Thienelt, Michael},
title = {NAVIO - A Navigation Service of Pedestrians},
journal = {Journal of Space Communication},
year = {2006},
volume = {Global Navigation},
number = {9},
numpages = {10},
url = {www.spacejournal.org},
note = {invited}
}