To cite package 'SCI' in publications use:

Gudmundsson, L. & Stagge, J. H. (2014). SCI: Standardized Climate Indices such as SPI, SRI or SPEIR package version 1.0-1.

Stagee, J.H. ; Tallaksen, L.M.; Gudmundsson, L.; van Loon, A.; Stahl, K. Candidate Distributions for Climatological Drought Indices (SPI and SPEI), 2014, submitted.

Corresponding BibTeX entries:

  @Manual{,
    title = {SCI: Standardized Climate Indices such as SPI, SRI or
      SPEI},
    author = {Lukas Gudmundsson and James H. Stagge},
    year = {2014},
    note = {R package version 1.0-1},
  }
  @Article{,
    title = {Candidate Distributions for Climatological Drought Indices
      (SPI and SPEI)},
    author = {J. H. Stagge and L. M. Tallaksen and L. Gudmundsson and
      A. van Loon and K. Stahl},
    journal = {submitted},
    year = {2014},
  }