To cite the 'ASSA' package in publications use:

Miguel de Carvalho and Gabriel Martos(2018). ASSA: Applied Singular Spectrum Analysis.R package version 1.0.

Corresponding BibTeX entry:

  @Manual{,
    title = {ASSA: Applied Singular Spectrum Analysis},
    author = {M. {de Carvalho} and G. Martos},
    year = {2018},
    note = {R package version 1.0},
  }