Jürgen Schurr Jürgen Melcher Klaus Pierz Günter Hein Franz-Josef Ahlers The width of AC quantum Hall plateaus. 826-829 2004 53 IEEE T. Instrumentation and Measurement 3 http://dx.doi.org/10.1109/TIM.2004.827066 db/journals/tim/tim53.html#SchurrMPHA04