Kazunori Iwata Nobuhiro Ito Youhei Kaneda Naohiro Ishii Complexity of Road Networks as Agents' Environments. 474-484 2008 KES-AMSTA http://dx.doi.org/10.1007/978-3-540-78582-8_48 conf/kesamsta/2008 db/conf/kesamsta/kesamsta2008.html#IwataIKI08