To cite package ‘Copula.surv’ in publications use:

  Emura T (2026). _Copula.surv: Analysis of Bivariate Survival Data
  Based on Copulas_. R package version 3.1,
  <https://CRAN.R-project.org/package=Copula.surv>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Copula.surv: Analysis of Bivariate Survival Data Based on Copulas},
    author = {Takeshi Emura},
    year = {2026},
    note = {R package version 3.1},
    url = {https://CRAN.R-project.org/package=Copula.surv},
  }