@inbook{ff31ad0ec8c049a3b34e58a5fa14c142,
title = "Power laws in urban supply networks, social systems, and dense pedestrian crowds",
author = "D Helbing and C K{\"u}hnert and S L{\"a}mmer and A Johansson and B Gehlsen and H Ammoser and \{West G\}, B",
year = "2009",
language = "English",
pages = "433 -- 450",
editor = "D Lane and \{van der Leeuw\}, S and D Pumain and G West",
booktitle = "Complexity Perspectives in Innovation and Social Change",
publisher = "Springer Netherlands",
address = "Netherlands",
}