The onset of the fast dynamics in glassy polystyrene observed by the detrapping of guest molecules: A high-field Electron Paramagnetic Resonance studyV. Bercu, M. Martinelli, C. A. Massa, L. A. Pardi and D. LeporiniEurophys. Lett., 72 4 (2005) 590-596DOI: https://doi.org/10.1209/epl/i2005-10290-0