Topological patterns in street networks of self-organized urban settlementsJ. Buhl, J. Gautrais, N. Reeves, R. V. Solé, S. Valverde, P. Kuntz and G. TheraulazEur. Phys. J. B, 49 4 (2006) 513-522DOI: https://doi.org/10.1140/epjb/e2006-00085-1