To cite package ‘Rtnmin’ in publications use:

Nash JC, Nash SG (2016). Rtnmin: Truncated Newton Function Minimization with Bounds Constraints. R package version 2016-7.7, https://CRAN.R-project.org/package=Rtnmin.

Corresponding BibTeX entry:

  @Manual{,
    title = {Rtnmin: Truncated Newton Function Minimization with Bounds
      Constraints},
    author = {John C Nash and Stephen G Nash},
    year = {2016},
    note = {R package version 2016-7.7},
    url = {https://CRAN.R-project.org/package=Rtnmin},
  }