@article{santos_2003,  title={Introduction to quantum Monte Carlo simulations for fermionic systems},  volume={33},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332003000100003},  DOI={10.1590/S0103-97332003000100003},  number={1},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Santos, Raimundo R. dos},  year={2003},  month={Mar},  pages={36–54} }