To cite package ‘nnsolve’ in publications use:

  Kontemeniotis N, Tsagris M (2026). _nnsolve: Fast Non-Negative Least
  Squares_. R package version 0.0.2,
  <https://CRAN.R-project.org/package=nnsolve>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nnsolve: Fast Non-Negative Least Squares},
    author = {Nikolaos Kontemeniotis and Michail Tsagris},
    year = {2026},
    note = {R package version 0.0.2},
    url = {https://CRAN.R-project.org/package=nnsolve},
  }