1. Alfrey, T., Mechanical Behavior of High Polymers, 1st Ed., pp.557-564; Interscience Publishers, Inc., New York, 1948.
2. Freudenthal, A. M., The Inelastic Behavior of Engineering Materials and Structures, 1st Ed., pp.220-248, 518-519,John Wiley & Sons, Inc., New York, 1950.
3. Experimental Evidence of the Viscous Behavior of Grain Boundaries in Metals
4. Creep Buckling of Columns