To cite package ‘wsbackfit’ in publications use:

Roca-Pardinas J, Rodriguez-Alvarez M, Sperlich S (2021). wsbackfit: Weighted Smooth Backfitting for Structured Models. R package version 1.0-5, https://CRAN.R-project.org/package=wsbackfit.

Corresponding BibTeX entry:

  @Manual{,
    title = {wsbackfit: Weighted Smooth Backfitting for Structured
      Models},
    author = {Javier Roca-Pardinas and Maria Xose Rodriguez-Alvarez and
      Stefan Sperlich},
    year = {2021},
    note = {R package version 1.0-5},
    url = {https://CRAN.R-project.org/package=wsbackfit},
  }