Angi Voß Ivan Denisovich Peter Gatalsky Kiriakos Gavouchidis Andreas Klotz Stefanie Roeder Hans Voß 635-651 2004 28 Computers, Environment and Urban Systems 6 http://dx.doi.org/10.1016/j.compenvurbsys.2003.12.003 db/journals/urban/urban28.html#VossDGGKRV04