Insights into a spatially embedded social network from a large-scale snowball sample J. Illenberger, M. Kowald, K.W. Axhausen and K. Nagel Eur. Phys. J. B, 84 4 (2011) 549-561 Published online: 25 May 2011 DOI: 10.1140/epjb/e2011-10872-0