Osterberg, William P. "Intervention and the Bid-Ask Spread in G-3 Foreign Exchange Rates," in Federal Reserve Bank of Cleveland. "1992 Quarter 2, Vol. 28, No. 2," Economic Review (Federal Reserve Bank of Cleveland) (1992 Quarter 2) : 3-14. https://fraser.stlouisfed.org/title/1328/item/4738/toc/338693 , accessed on April 19, 2024.