To cite package ‘TTM’ in publications use:

  Wang T, Li Z (2026). _TTM: Terminal Trend Models on the Retrospective
  Time Scale_. R package version 0.1.0,
  <https://CRAN.R-project.org/package=TTM>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {TTM: Terminal Trend Models on the Retrospective Time Scale},
    author = {Tingchang Wang and Zhigang Li},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=TTM},
  }