1. Increasing Returns and Path Dependence in the Economy;Arthur,1994
2. Black, D., Henderson, J.V., 1999. Urban Evolution in the USA. Brown University and London School of Economics, mimeo.
3. Population Growth in Standard Metropolitan Areas 1900 – 1950;Bogue,1953
4. Christaller, W., 1933. In translation (1966), Central Places in Southern Germany, translated by Baskin, C.W. Prentice–Hall, Englewood Cliffs, New Jersey.
5. Dynamic evolution of the U.S. city size distribution;Dobkins,2000