To cite package ‘nnmf’ in publications use:

  Tsagris M, Kontemeniotis N, Adam C (2026). _nnmf: Nonnegative Matrix
  Factorization_. R package version 1.4,
  <https://CRAN.R-project.org/package=nnmf>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nnmf: Nonnegative Matrix Factorization},
    author = {Michail Tsagris and Nikolaos Kontemeniotis and Christos Adam},
    year = {2026},
    note = {R package version 1.4},
    url = {https://CRAN.R-project.org/package=nnmf},
  }