Williams, John C. (John Carroll) and Federal Reserve Bank of San Francisco. "Unconventional Monetary Policy: Lessons from the Past Three Years : Presentation to the Swiss National Bank Research Conference, Zurich, Switzerland" in Statements and Speeches of John C. Williams (September 23, 2011). https://fraser.stlouisfed.org/title/9040/item/671827, accessed on August 2, 2024.