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Strunk, Christoph and Paschen, U. and Surgers, C. and Löhneysen, H. v. (1994) Pair-breaking mechanisms in Nb/Gd/Nb films. Physica B Condensed Matter 194, pp. 2403-2404.
Strunk, Christoph and Surgers, C. and Paschen, U. and Löhneysen, H. v. (1994) Superconductivity in layered Nb/Gd films. Physical Review B (PRB) 49 (6), pp. 4053-4063.