Theory of transport in inhomogeneous systems and application to magnetic multilayer systems : The 6th joint magnetism and magnetic materials (MMM)−intermag conferenc - Butler, W. H.; Zhang, X.-G.; Nicholson, D. M. C.; MacLaren, J. M. (American Institute of Physics (AIP), 1994)
http://dx.doi.org/10.1063/1.358136
Keywords: U