To cite SIS in publications use:

Saldana DF and Feng Y (2018). “SIS: An R Package for Sure Independence Screening in Ultrahigh-Dimensional Statistical Models.” Journal of Statistical Software, 83(2), pp. 1–25. doi: 10.18637/jss.v083.i02.

Corresponding BibTeX entry:

  @Article{,
    title = {{SIS}: An {R} Package for Sure Independence Screening in
      Ultrahigh-Dimensional Statistical Models},
    author = {Diego Franco Saldana and Yang Feng},
    journal = {Journal of Statistical Software},
    year = {2018},
    volume = {83},
    number = {2},
    pages = {1--25},
    doi = {10.18637/jss.v083.i02},
  }