To cite package ‘btb’ in publications use:

  Dos Santos A, Sémécurbe F, Pramil J (2022). _btb: Beyond the Border -
  Kernel Density Estimation for Urban Geography_. R package version
  0.2.0, , <https://github.com/inseefr/btb>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {btb: Beyond the Border - Kernel Density Estimation for Urban
Geography},
    author = {Arlindo {Dos Santos} and François Sémécurbe and Julien Pramil},
    year = {2022},
    note = {R package version 0.2.0, },
    url = {https://github.com/inseefr/btb},
  }