To cite package ‘assist’ in publications use:

Wang Y, Ke C (2023). assist: A Suite of R Functions Implementing Spline Smoothing Techniques. R package version 3.1.9, https://CRAN.R-project.org/package=assist.

Corresponding BibTeX entry:

  @Manual{,
    title = {assist: A Suite of R Functions Implementing Spline
      Smoothing Techniques},
    author = {Yuedong Wang and Chunlei Ke},
    year = {2023},
    note = {R package version 3.1.9},
    url = {https://CRAN.R-project.org/package=assist},
  }