1. Hodgson, J. W., A.S.L.E. Trans.14, 318 (1971).
2. Wada, S. andH. Hayashi, Bull. Japan Soc. Mech. Eng.14, 279 (1971).
3. Appeldoorn, J. K. andW. Philippoff, Amer. Chem. Soc. Preprints, Div. Petr. Chem., Atl. City, Sept. (1962).
4. Tager, A. A. andV. E. Dreval, Rheol. Acta9, 517 (1970).
5. Johnson, R. H. andW. A. Wright, Soc. Auto. Eng. Paper n� 680072, S.A.E. Annual Meeting, Detroit, Mich. (1968).