To cite package ‘localsolver’ in publications use:

Sokolowski W, Jakuczun W, Okinczyc N, Kaminski B (2014). localsolver: R API to LocalSolver. R package version 2.3, https://CRAN.R-project.org/package=localsolver.

Corresponding BibTeX entry:

  @Manual{,
    title = {localsolver: R API to LocalSolver},
    author = {Walerian Sokolowski and Wit Jakuczun and Natalia Okinczyc
      and Bogumil Kaminski},
    year = {2014},
    note = {R package version 2.3},
    url = {https://CRAN.R-project.org/package=localsolver},
  }