https://fdzul.r-universe.dev/popmexhttps://fdzul.r-universe.dev/api/packages/popmexhttps://fdzul.r-universe.dev/popmex/popmex.pdfhttps://fdzul.r-universe.dev/popmex/doc/manual.htmlhttps://fdzul.r-universe.dev/popmex/citationhttps://fdzul.r-universe.dev/popmex/citation.txthttps://fdzul.r-universe.dev/popmex/citation.cff