To cite package ‘sssp’ in publications use:

  Shen J, Damadi S (2026). “Sparse projection onto semi-symmetric sets
  with applications to sparse optimization.” _Journal of Global
  Optimization_. doi:10.1007/s10898-026-01592-y
  <https://doi.org/10.1007/s10898-026-01592-y>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Sparse projection onto semi-symmetric sets with applications to sparse optimization},
    author = {J. Shen and S. Damadi},
    journal = {Journal of Global Optimization},
    year = {2026},
    doi = {10.1007/s10898-026-01592-y},
  }