Federal Reserve Bank of San Francisco. "Monetary Policy Expectations at the Zero Lower Bound : Working Paper 2013-18, Working Paper 2013-18" in Working Papers (Federal Reserve Bank of San Francisco)
(May 21, 2015).
https://fraser.stlouisfed.org/title/7038/item/639412/content/pdf/frbsf_wp2013-18, accessed on July 3, 2025.