To cite package 'decompTumor2Sig' in publications use:

  Krueger S, Piro RM (2019) decompTumor2Sig: Decompose individual
  tumors to mutational signatures. BMC Bioinformatics 20(Suppl 4):152.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {decompTumor2Sig: Identification of mutational signatures active in individual tumors},
    author = {Sandra Kr"uger and Rosario M. Piro},
    volume = {20},
    number = {Suppl 4},
    pages = {152},
    year = {2019},
    journal = {BMC Bioinformatics},
  }

  Krueger S, Piro RM (2017) Identification of mutational signatures
  active in individual tumors. PeerJ Preprints 5:e3257v1 (Proceedings
  of the NETTAB 2017 Workshop on Methods, Tools & Platforms for
  Personalized Medicine in the Big Data Era, October 16-18, 2017 in
  Palermo, Italy).

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Identification of mutational signatures active in individual tumors},
    author = {Sandra Kr"uger and Rosario M. Piro},
    journal = {PeerJ Preprints},
    volume = {5},
    pages = {e3257v1},
    year = {2017},
  }

  Piro RM, Krueger S (2022). decompTumor2Sig: Decomposition of
  individual tumors into mutational signatures. R package version
  2.21.0.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {decompTumor2Sig: Decompose individual tumors to mutational signatures},
    author = {Sandra Kr"uger and Rosario M. Piro},
    year = {2022},
    note = {R package version 2.21.0},
  }