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://alf.physik.uni-wuerzburg.de.

The package’s reference paper is:
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},  
}