@article{martins-filho_2026,  title={Spin correlations in two-particle systems: a pedagogically motivated comparison of computational approaches},  volume={48},  ISSN={1806-1117},  url={https://doi.org/10.1590/1806-9126-RBEF-2026-0134},  DOI={10.1590/1806-9126-RBEF-2026-0134},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Martins-Filho, S.},  year={2026},  pages={e20260134} }