https://cran.r-universe.dev/SigOptRhttps://cran.r-universe.dev/api/packages/SigOptRhttps://cran.r-universe.dev/SigOptR/SigOptR.pdfhttps://cran.r-universe.dev/SigOptR/doc/manual.htmlhttps://cran.r-universe.dev/SigOptR/citationhttps://cran.r-universe.dev/SigOptR/citation.txthttps://cran.r-universe.dev/SigOptR/citation.cff