This slide, the previous slide and the next slide are from:
R. Degenhardt, H. Klein, A. Kling, H. Temmen, R. Zimmermann (DLR Institute of Structural Mechanics, Braunschweig, Germany), “Buckling and postbuckling analysis of shells under quasi-static and dynamic loads”, undated pdf file; no references; possibly created about 2005.
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