To cite package ‘psoptim’ in publications use:

Ciupke K (2016). psoptim: Particle Swarm Optimization. R package version 1.0, https://CRAN.R-project.org/package=psoptim.

Corresponding BibTeX entry:

  @Manual{,
    title = {psoptim: Particle Swarm Optimization},
    author = {Krzysztof Ciupke},
    year = {2016},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=psoptim},
  }