To cite package ‘sysbreak’ in publications use:

  Qu Z, Kim C, Perron P (2026). _sysbreak: Structural Breaks in a
  System of Equations_. R package version 1.1.0,
  <https://CRAN.R-project.org/package=sysbreak>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {sysbreak: Structural Breaks in a System of Equations},
    author = {Zhongjun Qu and Cheolju Kim and Pierre Perron},
    year = {2026},
    note = {R package version 1.1.0},
    url = {https://CRAN.R-project.org/package=sysbreak},
  }