Low-noise modular microsusceptometer using nearly quantum limited dc SQUIDs - Awschalom, D. D.; Rozen, J. R.; Ketchen, M. B.; Gallagher, W. J.; Kleinsasser, A. W.; Sandstrom, R. L.; Bumble, B. (American Institute of Physics (AIP), 1988)
http://dx.doi.org/10.1063/1.100291
Keywords: U