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2. Variable residential density: Optimum traffic density and city size;Fisch;Geographical Analysis,1975
3. Market choices and optimum city size;Mills;American Economic Review (Proc.),1971
4. Discussion of ‘Congestion and the optimum city size’;Rothenberg;American Economic Review,1973
5. Congestion and the optimum city size;Sheshinsky;American Economic Review,1973