@article{quintino_greco_2026,  title={An Exact Geometrically Nonlinear 3D Truss Finite Element with Variable Axial Rigidity Based on Positional Formulation},  volume={23},  ISSN={1679-7825},  url={https://doi.org/10.1590/1679-7825/e8897},  DOI={10.1590/1679-7825/e8897},  number={2},  journal={Latin American Journal of Solids and Structures},  publisher={Individual owner},  author={Quintino, Aleff Gonçalves and Greco, Marcelo},  year={2026},  pages={e8897} }