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2. M. F. Ashby, Metall. Trans. A14 (1983) 1755.
3. L. J. Gibson and M. F. Ashby, “Cellular Solids: Structure and Properties” (Pergamon Press, Oxford, 1988).
4. J. M. Harper, “Extrusion of Foods” (CRC Press, Boca Raton, 1981).
5. E. Baer, “Engineering Design for Plastics” (Chapman and Hall, New York, 1964).