Christiano, Lawrence J. and Fitzgerald, Terry J. "The Business Cycle : It's Still a Puzzle," in Federal Reserve Bank of Chicago. "Fourth Quarter 1998, Volume XXII, Issue 4," Economic Perspectives (Federal Reserve Bank of Chicago) (Fourth Quarter 1998) : 58-85. https://fraser.stlouisfed.org/title/5288/item/578996/toc/526100 , accessed on April 23, 2024.