To cite package ‘planar’ in publications use:

Auguié B (2022). planar: Multilayer Optics. R package version 1.7.0, https://github.com/nano-optics/planar.

Corresponding BibTeX entry:

  @Manual{,
    title = {planar: Multilayer Optics},
    author = {Baptiste Auguié},
    year = {2022},
    note = {R package version 1.7.0},
    url = {https://github.com/nano-optics/planar},
  }