1. Mechanical Behavior of High Polymers;Alfrey,1948
2. Twelve Lectures on Theoretical Rheology;Reiner,1949
3. Sometimes the coordinate system used in this book will be marked as x, y, and z, which are equivalent to x1, x2, and x3, respectively.
4. Stress tensor is a particular case of a more general concept of tensors. This particular case is called tensor of the second rank.
5. Those who are interested to understand more about tensor analysis may use textbooks, such as for example, R. Aris, Vectors, Tensors and the Basic Equations of Fluid Mechanics, Prentice Hall, Englewood Cliffs, 1962; or E.C. Young, Vector and Tensor Analysis, Marcel Dekker, New York, 1993.