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3. Wiedemann, J., Leichtbau Konstruktion, Vol. 2, Springer-Verlag, Berlin, 1997.
4. Bassetti, D. et. al., “Genetic algorithm and performance indices applied to optimal design of sandwich structures”, in Mechanics of Sandwich Structures, A. Vautrin (ed.), Kluwer Academic Publisher, Dordrecht, pp. 387–395, 1998.
5. Ashby, M.F., “Materials and Shape”, Acta Metall. Mater., Vol. 39/6, pp. 1025–1039, 1991.