To cite QZ in a publication use:

Chen W (2013). “QZ: QZ Decomposition.” R Package, URL https://cran.r-project.org/package=QZ.

Chen W (2019). A Quick Guide for the QZ Package. R Vignette, URL https://cran.r-project.org/package=QZ.

Corresponding BibTeX entries:

  @Misc{Chen2013QZpackage,
    title = {{QZ}: {QZ} Decomposition},
    author = {Wei-Chen Chen},
    year = {2013},
    note = {{R} Package, URL https://cran.r-project.org/package=QZ},
  }

  @Manual{Chen2019QZvignette,
    title = {A Quick Guide for the {QZ} Package},
    author = {Wei-Chen Chen},
    year = {2019},
    note = {{R} Vignette, URL https://cran.r-project.org/package=QZ},
  }