https://alrobles.r-universe.dev/xplushttps://alrobles.r-universe.dev/api/packages/xplushttps://alrobles.r-universe.dev/xplus/doc/manual.pdfhttps://alrobles.r-universe.dev/xplus/doc/manual.htmlhttps://alrobles.r-universe.dev/xplus/NEWShttps://alrobles.r-universe.dev/xplus/NEWS.txthttps://alrobles.r-universe.dev/xplus/citationhttps://alrobles.r-universe.dev/xplus/citation.txthttps://alrobles.r-universe.dev/xplus/citation.cff