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3. C. A. Berg,The Deformation of Free Boundaries in Plane Viscous Creep, Z. angew. Math. Phys.15, 300–306 (1964).
4. A. C. Eringen,Nonlinear Theory of Continuous Media, McGraw-Hill Book Co., New York 1962.
5. F. A. McClintock,On the Plasticity of the Growth of Fatigue Cracks, Proc. International Conference on Fracture of Solids (Maple Valley, Wash. 1962), Interscience, New York 1963, pp. 65, 102.