To cite package ‘selectKSigs’ in publications use:

  Yang Z (2021). _selectKSigs: Selecting the number of mutational
  signatures using a perplexity-based measure and cross-validation_. R
  package version 1.17.0,
  <https://bioconductor.org/packages/selectKSigs>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {selectKSigs: Selecting the number of mutational signatures using a
perplexity-based measure and cross-validation},
    author = {Zhi Yang},
    year = {2021},
    note = {R package version 1.17.0},
    url = {https://bioconductor.org/packages/selectKSigs},
  }