@Article{ carsan04, author = { Carlier, Guillaume and Santambrogio, Filippo }, title = { A Variational Model for Urban Planning with Traffic Congestion }, journal = { ESAIM: COCV }, year = { 2005 }, volume = { 11 }, number = { 4 }, pages = { 595-613 }, URL = { http://cvgmt.sns.it/paper/72/ }, note = { cvgmt preprint} }