Nb/Al/sub 2/O/sub 3//Nb-Josephson voltages standards at 1 V and 10 V Popel, R. ; Niemeyer, J. ; Fromknecht, R. ; Meier, W. ; Grimm, L. ; Dunschede, F. W. Abstract Publication: IEEE Transactions on Instrumentation Measurement Pub Date: April 1991 DOI: 10.1109/TIM.1990.1032943 Bibcode: 1991ITIM...40..298P