To cite package ‘ICtest’ in publications use:

  Nordhausen K, Oja H, Tyler D, Virta J (2022). _ICtest: Estimating and
  Testing the Number of Interesting Components in Linear Dimension
  Reduction_. R package version 0.3-5,
  <https://CRAN.R-project.org/package=ICtest>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ICtest: Estimating and Testing the Number of Interesting Components in
Linear Dimension Reduction},
    author = {Klaus Nordhausen and Hannu Oja and David E. Tyler and Joni Virta},
    year = {2022},
    note = {R package version 0.3-5},
    url = {https://CRAN.R-project.org/package=ICtest},
  }