To cite package ‘janus’ in publications use:

  Vercellino G (2022). _janus: Optimized Recommending System Based on
  'tensorflow'_. R package version 1.0.0,
  <https://CRAN.R-project.org/package=janus>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {janus: Optimized Recommending System Based on 'tensorflow'},
    author = {Giancarlo Vercellino},
    year = {2022},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=janus},
  }