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1. Introduction; 2. The conventional system of electrical units; 2.1. The determination of RK and KJ ; 2.2. Conventional values for RK and KJ ; 3. The Josephson voltage standard; 3.1. Theoretical background of the Josephson effect; 3.2. Conventional Josephson voltage standard; 3.3. Programmable voltage standards; 4. The quantum Hall resistance standard; 4.1. Basic principles; 4.2. Edge state model; 4.3. The two-dimensional electron gas; 4.4. Measurement techniques; 4.5. Universality of the quantised Hall resistance; 4.6. The use of the QHR as a standard of resistance; 4.7. A.c. measurements of the QHR; 5. Conclusions
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