United States. Department of the Treasury. "Income tax treaty with USA and USSR (ENGLISH VERSION ONLY), June 20, 1973," in United States. Department of the Treasury. "Volume 184," Press Releases of the United States Department of the Treasury (April 27, 1973 - June 29, 1973) : 922-925. https://fraser.stlouisfed.org/title/6111/item/587027/toc/543295 , accessed on June 25, 2024.