To cite package ‘Xeva’ in publications use:

  Mer A, Haibe-Kains B (2023). _Xeva: Analysis of patient-derived
  xenograft (PDX) data_. R package version 1.21.0,
  <https://bioconductor.org/packages/Xeva>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Xeva: Analysis of patient-derived xenograft (PDX) data},
    author = {Arvind Mer and Benjamin Haibe-Kains},
    year = {2023},
    note = {R package version 1.21.0},
    url = {https://bioconductor.org/packages/Xeva},
  }