https://cran.r-universe.dev/dfphase1https://cran.r-universe.dev/api/packages/dfphase1https://cran.r-universe.dev/dfphase1/dfphase1.pdfhttps://cran.r-universe.dev/dfphase1/doc/manual.htmlhttps://cran.r-universe.dev/dfphase1/NEWShttps://cran.r-universe.dev/dfphase1/NEWS.txthttps://cran.r-universe.dev/dfphase1/citationhttps://cran.r-universe.dev/dfphase1/citation.txthttps://cran.r-universe.dev/dfphase1/citation.cff