Localized fast relaxation in poly(methyl methacrylate) glassA. Mermet, E. Duval, N. V. Surovtsev, J. F. Jal, A. J. Dianoux and A. F. YeeEurophys. Lett., 38 7 (1997) 515-520DOI: https://doi.org/10.1209/epl/i1997-00276-4