If you use iminuit for work/research presented in a publication, we would be happy if you mention us in the acknowledgments, like so:

This research made use of the MINUIT algorithm\cite{1975CoPhC..10..343J} via the iminuit\cite{iminuit} Python library.

You can get a BibTeX entry for the version that you used from Zenodo. Go to https://doi.org/10.5281/zenodo.3949207, select the appropriate version, and click on "BibTex" in the Export box on the bottom right. You will get an entry like this:

@software{iminuit,
  author       = {Hans Dembinski and
                  Piti Ongmongkolkul and
                  Christoph Deil and
                  David Menéndez Hurtado and
                  Matthew Feickert and
                  Henry Schreiner and
                  Andrew and
                  Chris Burr and
                  Fabian Rost and
                  Alex Pearce and
                  Lukas Geiger and
                  Bernhard M. Wiedemann and
                  Omar  Zapata},
  title        = {scikit-hep/iminuit: v1.4.9},
  month        = jul,
  year         = 2020,
  publisher    = {Zenodo},
  version      = {v1.4.9},
  doi          = {10.5281/zenodo.3951328},
  url          = {https://doi.org/10.5281/zenodo.3951328}
}

The recommended reference for the MINUIT algorithms is:

@ARTICLE{1975CoPhC..10..343J,
   author = {{James}, F. and {Roos}, M.},
    title = "{Minuit -- A System for Function Minimization and Analysis of the Parameter Errors and Correlations}",
  journal = {Computer Physics Communications},
     year = 1975,
    month = dec,
   volume = 10,
    pages = {343-367},
      doi = {10.1016/0010-4655(75)90039-9},
   adsurl = {http://adsabs.harvard.edu/abs/1975CoPhC..10..343J},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
