1. Wilkinson, W. L., Non-Newtonian Fluids (London 1960).
2. Giesekus, Hanswalter, Rheol. Acta2, 112 (1962).
3. Chemical Statistics Handbook, Manufacturing Chemists Association (1960).
4. U. S. Tariff Commission — Current Series P-62 Reports.
5. Chemical Week Sept. 29, 1962, p. 32., Sept. 29.