United States. President and Council of Economic Advisers (U.S.). "Chain-Type Quantity Indexes for Gross Domestic Product," in United States. President and Council of Economic Advisers (U.S.). "2013," Economic Report of the President (2013) : 334-335. https://fraser.stlouisfed.org/title/45/item/8112/toc/412547 , accessed on March 18, 2024.