To cite package ‘TreeRingShape’ in publications use:

  ISHIDA M (2024). _TreeRingShape: Recording Tree-Ring Shapes of Tree
  Disks with Manual Digitizing and Interpolating Model_. R package
  version 3.0.5, <https://CRAN.R-project.org/package=TreeRingShape>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {TreeRingShape: Recording Tree-Ring Shapes of Tree Disks with Manual Digitizing
and Interpolating Model},
    author = {Megumi ISHIDA},
    year = {2024},
    note = {R package version 3.0.5},
    url = {https://CRAN.R-project.org/package=TreeRingShape},
  }