To cite PSF in publications use:

Bokde N, Asencio-Cortés G, Martínez-Álvarez F, Kulat K (2017). “PSF: Introduction to R Package for Pattern Sequence Based Forecasting Algorithm.” The R Journal, 9(1), 324–333. doi:10.32614/RJ-2017-021. https://doi.org/10.32614/RJ-2017-021.

Corresponding BibTeX entry:

  @Article{,
    title = {{PSF: Introduction to R Package for Pattern Sequence Based
      Forecasting Algorithm}},
    author = {Neeraj Bokde and Gualberto Asencio-Cortés and Francisco
      Martínez-Álvarez and Kishore Kulat},
    journal = {{The R Journal}},
    year = {2017},
    doi = {10.32614/RJ-2017-021},
    number = {1},
    volume = {9},
    pages = {324--333},
    url = {https://doi.org/10.32614/RJ-2017-021},
  }