Spectral densities of response functions for the O(3) symmetric Anderson and two channel Kondo models S. C. Bradley, R. Bulla, A. C. Hewson and G-M. Zhang Eur. Phys. J. B, 11 4 (1999) 535-550 Published online: 15 October 1999 DOI: 10.1007/s100510051181