If you use ALF, please don’t forget to mention the package and the corresponding paper in any publication:

The auxillary-field QMC simulations were carried out with the ALF package available at https://git.physik.uni-wuerzburg.de/ALF/ALF/-/tree/ALF-2.0.

The package’s reference paper is:

ALF Collaboration, arXiv:2012.11914 [cond-mat.str-el].

The corresponding Bibtex entry:

@Misc{ALFQMC2,
      title={The ALF (Algorithms for Lattice Fermions) project release 2.0. Documentation for the auxiliary-field quantum Monte Carlo code}, 
      author={ALF Collaboration and F. F. Assaad and M. Bercx and F. Goth and A. Götz and J. S. Hofmann and E. Huffman and Z. Liu and F. Parisen Toldin and J. S. E. Portela and J. Schwab},
      year={2021},
      eprint={2012.11914},
      archivePrefix={arXiv},
      primaryClass={cond-mat.str-el}
}

In case you’re still using the (legacy) ALF 1.0 version, you can cite:

M. Bercx, F. Goth, J. S. Hofmann, and F. F. Assaad, SciPost Phys., vol. 3(2), p. 013, (2017).

The corresponding Bibtex entry:

@Article{ALFQMC,
 	title={{The ALF (Algorithms for Lattice Fermions) project release 1.0.  Documentation for the auxiliary field quantum Monte Carlo code}},  
 	author={Martin Bercx and Florian Goth and Johannes S. Hofmann and Fakher F. Assaad},
 	journal={SciPost Phys.},
 	volume={3},
 	issue={2},
 	pages={013},
 	year={2017},
 	publisher={SciPost},
 	doi={10.21468/SciPostPhys.3.2.013},
 	url={https://scipost.org/10.21468/SciPostPhys.3.2.013},
}