Yang, T;    Hillier, B;      (2007)    The fuzzy boundary: the spatial definition of urban areas.                     In: Kubat, A and Ertekin, O and Guney, Y and Eyuboglu, E, (eds.)  (Proceedings) 6th International Space Syntax Symposium. (pp. 091.01-091.16).  Istanbul Technical University: Istanbul, Turkey.       Green open access