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2. Eringen, A. C., Nonlinear Theory of Continuous Media, C. 10, McGraw-Hill, Inc., New York (1962).
3. Viscoelasticity, ed. by J. T. Bergen, Academic Press, New York, 1–27, 55–75 (1960).
4. Bland, D. R., The Theory of Linear Viscoelasticity, C. 3, 4 and 5, Pergamon Press, New York (1960).
5. Bulletin of the 20th Mtg., JANAF Solid Propellant Information Agency;A. San Miguel,1961