To cite package ‘xplus’ in publications use:

  Robles A (2026). _xplus: Positive and Unlabeled Learning from
  Unbalanced Cases and Sparse Structures_. R package version 1.0.2,
  <https://CRAN.R-project.org/package=xplus>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {xplus: Positive and Unlabeled Learning from Unbalanced Cases and Sparse
Structures},
    author = {Angel Robles},
    year = {2026},
    note = {R package version 1.0.2},
    url = {https://CRAN.R-project.org/package=xplus},
  }