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This paper reviews the development and use of Josephson voltage standards over the last 30 years, including classical dc standards, programmable standards based on binary weighted arrays, pulse-driven delta-sigma standards for ac wave-form synthesis, and single-flux-quantum voltage multipliers. ͓S0034-6748͑00͒00810-8͔doi:10.1063/1.1289507 fatcat:xakss77owfa5lhwz6wephchjcu