To cite the ftsa package, use:

Hyndman RJ, Shang HL (2021). ftsa: Functional Time Series Analysis. R package version 6.1, https://CRAN.R-project.org/package=ftsa.

Shang HL (2013). “ftsa: An R Package for Analyzing Functional Time Series.” The R Journal, 5(1), 64–72. https://journal.r-project.org/archive/2013-1/shang.pdf.

Corresponding BibTeX entries:

  @Manual{,
    title = {{ftsa}: Functional Time Series Analysis},
    author = {Rob J Hyndman and Han Lin Shang},
    year = {2021},
    note = {R package version 6.1},
    url = {https://CRAN.R-project.org/package=ftsa},
  }

  @Article{,
    title = {ftsa: An {R} Package for Analyzing Functional Time
      Series},
    author = {Han Lin Shang},
    journal = {The {R} Journal},
    volume = {5},
    number = {1},
    pages = {64--72},
    year = {2013},
    url = {https://journal.r-project.org/archive/2013-1/shang.pdf},
  }