1. Struik LCE (1978) Physical aging in amorphous polymers and other materials. Elsevier Scientific Publishing Company, Amsterdam
2. Kovacs AJ (1963) Transition vitreuse dans les polym�res amorphes. Fortschr Hochpolym-Forsch 3:394
3. Kovacs AJ (1958) J Polym Sci 30:131
4. Doolittle AK (1951) J Appl Phys 22:1471
5. Kovacs AJ, Hutchinson JM, Aklonis JJ (1977) Isobaric volume and enthalpy recovery of glasses. (I) A critical survey of recent phenomenological approaches, in: Gaskell PH (ed) The Structure of Non-Crystalline Materials, Taylor and Francis, pp 153