1. For example, see H. Green,Industrial Rheology and Rheological Structures(John Wiley and Sons, Inc., New York), Chapters 1–3.
2. See reference 1. Reproduced by permission.
3. The authors are acquainted with this work through the courtesy of seeing the report to the American Petroleum Institute, P.R.L.-9-49, by Fenske, Klaus, and Dannenbrink.