To cite package ‘admixr2’ in publications use:

  van de Beek H., Välitalo P.A.J., van Hasselt J.G.C., Zwep L.B.
  (2025). Aggregate data modelling: A fast implementation for fitting
  pharmacometrics models to summary-level data in R. Journal of
  Pharmacokinetics and Pharmacodynamics, 53(1), 3.
  https://doi.org/10.1007/s10928-025-10011-w

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Aggregate data modelling: A fast implementation for fitting pharmacometrics models to summary-level data in R},
    author = {Hidde {van de Beek} and Pyry A. J. Välitalo and J. G. Coen {van Hasselt} and Laura B. Zwep},
    journal = {Journal of Pharmacokinetics and Pharmacodynamics},
    year = {2025},
    volume = {53},
    number = {1},
    pages = {3},
    doi = {10.1007/s10928-025-10011-w},
  }

  Välitalo P.A.J. (2021). Pharmacometric estimation methods for
  aggregate data, including data simulated from other pharmacometric
  models. Journal of Pharmacokinetics and Pharmacodynamics, 48(5),
  623-638. https://doi.org/10.1007/s10928-021-09760-1

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Pharmacometric estimation methods for aggregate data, including data simulated from other pharmacometric models},
    author = {Pyry Antti Juhana Välitalo},
    journal = {Journal of Pharmacokinetics and Pharmacodynamics},
    year = {2021},
    volume = {48},
    number = {5},
    pages = {623--638},
    doi = {10.1007/s10928-021-09760-1},
  }