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References 61 [4.25] P. Weibel,M. Grioni, D. Malterre, B. Dardel, Y. Baer, and M. J. Besnus [Z. Phys. B 91, 337 (1993)] have reported that the <strong>Kondo</strong> peak is asymmetric and broader than the single-impurity calculation for YbAgCu4.