Anomalous spectral density and two-level system-phonon coupling in an insulating magnetic glass P. Doussineau, A. Levelut, M. Matecki, W. Schön et W.D. WallaceJ. Phys. France, 46 6 (1985) 979-986DOI: https://doi.org/10.1051/jphys:01985004606097900
