Federal Reserve Bank of San Francisco. "From Many Series, One Cycle: Improved Estimates of the Business Cycle from a Multivariate Unobserved Components Model" in Structural and Cyclical Elements in Macroeconomics, March 16, 2012
(October 2011).
https://fraser.stlouisfed.org/title/9966/item/735606, accessed on September 9, 2026.