To cite package ‘zooExtra’ in publications use:

Zeileis A, Grothendieck G (2026). zooExtra: Supplementary Functionality for zoo Time Series. R package version 0.1-1, https://codeberg.org/zeileis/zooextra.

Corresponding BibTeX entry:

  @Manual{,
    title = {zooExtra: Supplementary Functionality for zoo Time
      Series},
    author = {Achim Zeileis and Gabor Grothendieck},
    year = {2026},
    note = {R package version 0.1-1},
    url = {https://codeberg.org/zeileis/zooextra},
  }