To cite bifrost in publications, please use the following references,
as appropriate. Because bifrost relies on mvMORPH and its
penalized-likelihood framework, please also cite the mvMORPH references
below.

  Berv JS, Probst CM, Claramunt S, Shipley JR, Friedman M, Smith SA,
  Fouhey DF, Weeks BC (2026). “Rates of passerine body plan evolution
  in time and space.” _Nature Ecology & Evolution_. In press.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Rates of passerine body plan evolution in time and space},
    author = {Jacob S. Berv and Charlotte M. Probst and Santiago Claramunt and J. Ryan Shipley and Matt Friedman and Stephen A. Smith and David F. Fouhey and Brian C. Weeks},
    year = {2026},
    journal = {Nature Ecology & Evolution},
    note = {In press.},
  }

  Berv JS, Fox N, Thorstensen MJ, Lloyd-Laney H, Troyer EM, Rivero-Vega
  RA, Smith SA, Friedman M, Fouhey DF, Weeks BC (2026). “bifrost: an R
  package for scalable inference of phylogenetic shifts in multivariate
  evolutionary dynamics.” _bioRxiv_. doi:10.64898/2026.04.12.718036
  <https://doi.org/10.64898/2026.04.12.718036>. Preprint version 1.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {bifrost: an R package for scalable inference of phylogenetic shifts in multivariate evolutionary dynamics},
    author = {Jacob S. Berv and Nathan Fox and Matt J. Thorstensen and Henry Lloyd-Laney and Emily M. Troyer and Rafael A. Rivero-Vega and Stephen A. Smith and Matt Friedman and David F. Fouhey and Brian C. Weeks},
    year = {2026},
    journal = {bioRxiv},
    doi = {10.64898/2026.04.12.718036},
    note = {Preprint version 1.},
  }

  Berv JS, Fox N, Thorstensen MJ, Lloyd-Laney H, Troyer EM, Rivero-Vega
  RA, Smith SA, Friedman M, Fouhey DF, Weeks BC (2026). _Branch-Level
  Inference Framework for Recognizing Optimal Shifts in Traits_. R
  package version 0.1.4, <https://CRAN.R-project.org/package=bifrost>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Branch-Level Inference Framework for Recognizing Optimal Shifts in Traits},
    author = {Jacob S. Berv and Nathan Fox and Matt J. Thorstensen and Henry Lloyd-Laney and Emily M. Troyer and Rafael A. Rivero-Vega and Stephen A. Smith and Matt Friedman and David F. Fouhey and Brian C. Weeks},
    year = {2026},
    note = {R package version 0.1.4},
    url = {https://CRAN.R-project.org/package=bifrost},
  }

  Clavel J, Escarguel G, Merceron G (2015). “mvmorph: an R package for
  fitting multivariate evolutionary models to morphometric data.”
  _Methods in Ecology and Evolution_, *6*(11), 1311-1319.
  doi:10.1111/2041-210X.12420
  <https://doi.org/10.1111/2041-210X.12420>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {mvmorph: an R package for fitting multivariate evolutionary models to morphometric data},
    author = {Julien Clavel and Gilles Escarguel and Gildas Merceron},
    year = {2015},
    journal = {Methods in Ecology and Evolution},
    volume = {6},
    number = {11},
    pages = {1311-1319},
    doi = {10.1111/2041-210X.12420},
  }

  Clavel J, Aristide L, Morlon H (2019). “A Penalized Likelihood
  Framework for High-Dimensional Phylogenetic Comparative Methods and
  an Application to New-World Monkeys Brain Evolution.” _Systematic
  Biology_, *68*(1), 93-116. doi:10.1093/sysbio/syy045
  <https://doi.org/10.1093/sysbio/syy045>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A Penalized Likelihood Framework for High-Dimensional Phylogenetic Comparative Methods and an Application to New-World Monkeys Brain Evolution},
    author = {Julien Clavel and Leandro Aristide and Hélène Morlon},
    year = {2019},
    journal = {Systematic Biology},
    volume = {68},
    number = {1},
    pages = {93-116},
    doi = {10.1093/sysbio/syy045},
  }