To cite package ‘BTWAR’ in publications use:

  Brás-Geraldes, C., Rocha, J.L., Martins, F. (2026).
  Butterworth-Induced Autoregressive Model. Mathematics, 14(3), 479.
  https://doi.org/10.3390/math14030479

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Butterworth-Induced Autoregressive Model},
    author = {Carlos Brás-Geraldes and J. Leonel Rocha and Filipe Martins},
    journal = {Mathematics},
    year = {2026},
    volume = {14},
    number = {3},
    pages = {479},
    doi = {10.3390/math14030479},
  }