From the same paper as the previous 8 images.
The references are:
Klinkel, S. and Wagner, W. (1997), “A geometrical non-linear brick element based on the EAS-method”, Int. J. Numer. Meth. Eng., 40, 4529-4545.
Chroscielewski, J., Makowski, J. and Stumpf, H. (1992), “Genuinely resultant shell finite elements accounting for geometric and material non-linearity”, Int. J. Numer. Meth. Eng., 35, 63-94.
Betsch, P., Gruttmann, F. and Stein, E. (1996), “A 4-node finite shell element for the implementation of general hyperelastic 3D-elasticity at finite strains”, Comput. Meth. Appl. Mech. Eng., 130, 57-79
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