Brinkman, Jeffrey C. and Lin, Jeffrey. "The Costs and Benefits of Fixing Downtown Freeways," in Federal Reserve Bank of Philadelphia. "First Quarter 2022, Volume 7, Issue 1," Economic Insights (Federal Reserve Bank of Philadelphia) (January 2022) : 19-24. https://fraser.stlouisfed.org/title/6149/item/611764/toc/632615 , accessed on July 25, 2024.