Molecular motion in glassy polystyrenes Schaefer, Jacob ; Sefcik, M. D. ; Stejskal, E. O. ; McKay, R. A. ; Dixon, W. Thomas ; Cais, R. E. Abstract Publication: Macromolecules Pub Date: June 1984 DOI: 10.1021/ma00136a001 Bibcode: 1984MaMol..17.1107S