To cite package ‘geigen’ in publications use:

Hasselman B, Lapack authors (2019). geigen: Calculate Generalized Eigenvalues, the Generalized Schur Decomposition and the Generalized Singular Value Decomposition of a Matrix Pair with Lapack. R package version 2.3, https://CRAN.R-project.org/package=geigen.

Corresponding BibTeX entry:

  @Manual{,
    title = {geigen: Calculate Generalized Eigenvalues, the Generalized
      Schur Decomposition and the Generalized Singular Value
      Decomposition of a Matrix Pair with Lapack},
    author = {Berend Hasselman and {Lapack authors}},
    year = {2019},
    note = {R package version 2.3},
    url = {https://CRAN.R-project.org/package=geigen},
  }