To cite package ‘CFF’ in publications use:

Houshmand Nanehkaran F (2020). CFF: Simple Similarity for User-Based Collaborative Filtering Systems. R package version 1.0, https://CRAN.R-project.org/package=CFF.

Corresponding BibTeX entry:

  @Manual{,
    title = {CFF: Simple Similarity for User-Based Collaborative
      Filtering Systems},
    author = {Farimah {Houshmand Nanehkaran}},
    year = {2020},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=CFF},
  }