To cite fdaACF in publications use:

Mestre G, Portela J, Rice G, Muñoz San Roque A, Alonso E (2021). “Functional time series model identification and diagnosis by means of auto- and partial autocorrelation analysis.” Computational Statistics & Data Analysis, 155, 107108. https://doi.org/10.1016/j.csda.2020.107108.

Corresponding BibTeX entry:

  @Article{,
    title = {Functional time series model identification and diagnosis
      by means of auto- and partial autocorrelation analysis},
    author = {Guillermo Mestre and José Portela and Gregory Rice and
      Antonio {Muñoz San Roque} and Estrella Alonso},
    journal = {Computational Statistics & Data Analysis},
    year = {2021},
    volume = {155},
    pages = {107108},
    url = {https://doi.org/10.1016/j.csda.2020.107108},
  }