https://cran.r-universe.dev/smofhttps://cran.r-universe.dev/api/packages/smofhttps://cran.r-universe.dev/smof/smof.pdfhttps://cran.r-universe.dev/smof/doc/manual.htmlhttps://cran.r-universe.dev/smof/NEWShttps://cran.r-universe.dev/smof/NEWS.txthttps://cran.r-universe.dev/smof/citationhttps://cran.r-universe.dev/smof/citation.txthttps://cran.r-universe.dev/smof/citation.cff