To cite in publications use:

Bill Venables and Kurt Hornik and Martin Maechler (2019). polynom: A Collection of Functions to Implement a Class for Univariate Polynomial Manipulations. R package version 1.4-0.

Corresponding BibTeX entry:

  @Manual{,
    title = {polynom: A Collection of Functions to Implement a Class
      for Univariate Polynomial Manipulations},
    author = {Bill Venables and Kurt Hornik and Martin Maechler},
    year = {2019},
    note = {R package version 1.4-0. S original by Bill Venables,
      packages for R by Kurt Hornik and Martin Maechler.},
    url = {https://CRAN.R-project.org/package=polynom},
  }