Board of Governors of the Federal Reserve System (U.S.), 1935-. "Board seeks public comment on a regulatory framework that could be used to establish margin requirements on futures contracts based on stock indexes (Regulations G, T, and U)" in Press Releases of the Board of Governors of the Federal Reserve System
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https://fraser.stlouisfed.org/title/9237/item/695591, accessed on May 21, 2026.