https://plambertuliege.r-universe.dev/degrosshttps://plambertuliege.r-universe.dev/api/packages/degrosshttps://plambertuliege.r-universe.dev/degross/degross.pdfhttps://plambertuliege.r-universe.dev/degross/doc/manual.htmlhttps://plambertuliege.r-universe.dev/degross/citationhttps://plambertuliege.r-universe.dev/degross/citation.txthttps://plambertuliege.r-universe.dev/degross/citation.cff