1. Friedrich Chr (1984) Paper published in the Proceedings of the 1st Symposium on Rheology of the GDR, January 9?13, 1984, Berga/Elster; Institute of Mechanics of the Academy of Sciences of the GDR, Report-No. R-IMech-07/85, pp 20?31
2. Friedrich Chr, Heymann L (1988) In: Giesekus H, Hibberd MF (ed), Progress and Trends in Rheology II. Steinkopff Darmstadt, pp 102?104
3. Abdel-Khalik SI, Hassager O, Bird RB (1974) Polym Eng Sci 14:859?867
4. Wagner MH (1977) Rheol Acta 16:43?50
5. Gleissle W (1982) Rheol Acta 21:484?489