1. Staverman, A. J. andF. Schwarzl, in:H. A. Stuart, Die Physik der Hochpolymeren, Band IV (Berlin-Göttingen-Heidelberg 1956).
2. Schmieder, K. andK. Wolf, Kolloid-Z.127, 65–78 (1952).
3. Ferry, J. D., Viscoelastic properties of polymers (New York 1961).
4. Heijboer, J., Mechanical properties and molecular structure of organic polymers, Proc. Int. Congr. Physics Non-Crystalline Solids, Delft 1964, 231–254 (Amsterdam 1965).
5. Bussink, J. andJ. Heijboer, The effects of methylgroups in ortho position to the COO-link on the dynamic mechanical relaxation of some aromatic polyesters, ibid. pp. 388–396.