To cite package ‘BTtest’ in publications use:

Haimerl P (2024). BTtest: Estimate the Number of Factors in Large Nonstationary Datasets. R package version 0.10.3, https://CRAN.R-project.org/package=BTtest.

Corresponding BibTeX entry:

  @Manual{,
    title = {BTtest: Estimate the Number of Factors in Large
      Nonstationary Datasets},
    author = {Paul Haimerl},
    year = {2024},
    note = {R package version 0.10.3},
    url = {https://CRAN.R-project.org/package=BTtest},
  }