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Rossel, C. and Maeno, Y. and Morgenstern, Ingo (1989) Memory Effects in a Superconducting Y-Ba-Cu-O Single Crystal: A Similarity to Spin-Glasses. Physical Review Letters (PRL) 62 (6), pp. 681-684.
Keller, H.-J. and Pümpin, B. and Kündig, W. and Odermatt, W. and Patterson, B. D. and Schneider, Johannes W. and Simmler, H. and Connell, S. and Müller, K. A. and Bednorz, J. G. and Blazey, K. W. and Morgenstern, Ingo and Rossel, C. and Savic, I. M. (1988) Internal magnetic fields in YBa2Cu3O7−δ from Muon spin rotation experiments: Discussion in terms of a glasslike superconducting state. Physica C Superconductivity and its Applications 153-15 (1), pp. 71-74.