Chatterjee, Satyajit. "Agglomeration Economies : The Spark That Ignites a City?," in Federal Reserve Bank of Philadelphia. "Fourth Quarter 2003," Business Review (Federal Reserve Bank of Philadelphia) (Fourth Quarter 2003) : 6-13. https://fraser.stlouisfed.org/title/5580/item/557727/toc/522350 , accessed on April 19, 2024.