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Physical Review Letters - Tập 80 Số 1 - Trang 181-184
B. Martı́nez1, X. Obradors1, Ll. Balcells1, A. Rouanet2, C. Monty2
1Instituto de Ciencia de Materiales de Barcelona, CSIC, Campus UAB, Ballaterra08193, Spain
2Institut de Science et Génie de Materiaux et Procédés, CNRS. B.P. 5, Font Romeu Cedex, France

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