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, Data about subway length, number of stations are available on the wikipedia website
, GMP per capita data for different cities accross the world are available on Brookings Global Metromonitor website
, Surface area and population data for urbanized areas accross the world are
, The Railisa database is available on the UICs website
, Population and surface areas of countries were taken from the Demographic Yearbook
, All the data used for this study are available in tsv