three atrticles of Nikos Saligoras

Connecting the Fractal City.
http://zeta.math.utsa.edu/~yxk833/connecting.html

Complexity and Urban Coherence
http://zeta.math.utsa.edu/~yxk833/UrbanCoherence.html

Theory of the Urban Web
http://www.math.utsa.edu/ftp/salingar.old/urbanweb.html