https://mbq.r-universe.dev/rFernshttps://mbq.r-universe.dev/api/packages/rFernshttps://mbq.r-universe.dev/rFerns/rFerns.pdfhttps://mbq.r-universe.dev/rFerns/doc/manual.htmlhttps://mbq.r-universe.dev/rFerns/NEWShttps://mbq.r-universe.dev/rFerns/NEWS.txthttps://mbq.r-universe.dev/rFerns/citationhttps://mbq.r-universe.dev/rFerns/citation.txthttps://mbq.r-universe.dev/rFerns/citation.cff