1. Peng STJ, Landel RF (1981) J Appl Phys 52:5988
2. Matthys EF (1984) Proc 9th Int Congr Rheol Acapulco, Vol II:117
3. Savins JG (1968) Rheol Acta 7:87
4. Giesekus H, Langer G (1967) Rheol Acta 16:1
5. Bauer H, Meerlender G, Stern P, Rheol Acta (in press)