@article{azevedo_awruch_1999,  title={Geometric nonlinear dynamic analysis of plates and shells using eight-node hexahedral finite elements with reduced integration},  volume={21},  ISSN={0100-7386},  url={https://doi.org/10.1590/S0100-73861999000300007},  DOI={10.1590/S0100-73861999000300007},  number={3},  journal={Journal of the Brazilian Society of Mechanical Sciences},  publisher={The Brazilian Society of Mechanical Sciences},  author={Azevedo, Ricardo Lessa and Awruch, Armando Miguel},  year={1999},  month={Sep},  pages={446–462} }