To cite package ‘SomaticSignatures’ in publications use:

  Julian S. Gehring, Bernd Fischer, Michael Lawrence, Wolfgang Huber
  (2015): SomaticSignatures: Inferring Mutational Signatures from
  Single Nucleotide Variants. Bioinformatics July 10, 2015, btv408.
  doi:10.1093/bioinformatics/btv408

A BibTeX entry for LaTeX users is

  @Article{,
    title = {SomaticSignatures: Inferring Mutational Signatures from Single Nucleotide Variants.},
    author = {Julian S. Gehring and Bernd Fischer and Michael Lawrence and Wolfgang Huber},
    year = {2015},
    journal = {Bioinformatics},
    doi = {10.1093/bioinformatics/btv408},
  }