To cite package ‘forestGYM’ in publications use:

  Chai Z (2024). _forestGYM: Forest Growth and Yield Model Based on
  Clutter Model_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=forestGYM>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {forestGYM: Forest Growth and Yield Model Based on Clutter Model},
    author = {Zongzheng Chai},
    year = {2024},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=forestGYM},
  }