United States. Department of the Treasury. "Readout: U.S. Secretary of the Treasury Janet L. Yellen's Meeting With Swiss Finance Minister and Federal Councillor Ueli Maurer and Swiss National Bank Chairman Thomas Jordan," Press Releases of the United States Department of the Treasury (April 21, 2022). https://fraser.stlouisfed.org/title/6111/item/611874, accessed on June 21, 2025.