Giorgio Boella Iulian Mihai Giancarlo Marullo-Reedtz Pier Paolo Capra Enrico Gasparotto The IEN CCC bridge to scale the quantized Hall resistance to 1-Ω standards. 588-591 2005 54 IEEE T. Instrumentation and Measurement 2 http://dx.doi.org/10.1109/TIM.2004.843404 db/journals/tim/tim54.html#BoellaMMCG05