1. Kovacs AJ, Stratton RA, Ferry JD (1963) J Chem Phys 67:152
2. Struik LCE (1978) Physical Aging in Amorphous Polymers and Other Materials. Elsevier, Amsterdam
3. Booij HC, Palmen JHM (1978) Pol Eng Sci 18:78
4. Lim CK, Cohen RE, Tschoegl NW (1971) Adv Chem Series no 99 Am Chem Soc. Washington DC
5. Fesko DG, Tschoegl NW (1971) J Polym Sci 35:41