Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Initial Margin Requirements Under Regulations T, U, G, and X," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "1988," Annual Report of the Board of Governors of the Federal Reserve System (1988) : 228-228. https://fraser.stlouisfed.org/title/117/item/2444/toc/403796 , accessed on March 28, 2024.