To cite package ‘vstdct’ in publications use:

  Klockmann K, Krivobokova T (2023). _vstdct: Nonparametric Estimation
  of Toeplitz Covariance Matrices_. R package version 0.2,
  <https://CRAN.R-project.org/package=vstdct>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {vstdct: Nonparametric Estimation of Toeplitz Covariance Matrices},
    author = {Karolina Klockmann and Tatyana Krivobokova},
    year = {2023},
    note = {R package version 0.2},
    url = {https://CRAN.R-project.org/package=vstdct},
  }