6Camagn Roberto,Gibell Maria Cristina,Rigamont Paolo.Urbanmobility and urban form:the social and environmental costs of different patterns of urban expansion. Ecological Economics . 2002
7Harrsi C D.A functional classification of cities in the United States. Geographical Review . 1943
8William Alonso.Location and Land Use toward a general theory of land rent. . 1966
9Francois Perroux.Economic Spaces: Theory and Application. Quarterly Journal . 1955
