https://jacky11.r-universe.dev/cp4phttps://jacky11.r-universe.dev/api/packages/cp4phttps://jacky11.r-universe.dev/cp4p/cp4p.pdfhttps://jacky11.r-universe.dev/cp4p/doc/manual.htmlhttps://jacky11.r-universe.dev/cp4p/citationhttps://jacky11.r-universe.dev/cp4p/citation.txthttps://jacky11.r-universe.dev/cp4p/citation.cff