To cite package ‘npregderiv’ in publications use:

Savchuk O, Volinsky A (2020). npregderiv: Nonparametric Estimation of the Derivatives of a Regression Function. R package version 1.0, https://CRAN.R-project.org/package=npregderiv.

Corresponding BibTeX entry:

  @Manual{,
    title = {npregderiv: Nonparametric Estimation of the Derivatives of
      a Regression Function},
    author = {Olga Savchuk and Alex Volinsky},
    year = {2020},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=npregderiv},
  }