https://sinnweja.r-universe.dev/vcpenhttps://sinnweja.r-universe.dev/api/packages/vcpenhttps://sinnweja.r-universe.dev/vcpen/vcpen.pdfhttps://sinnweja.r-universe.dev/vcpen/doc/manual.htmlhttps://sinnweja.r-universe.dev/vcpen/NEWShttps://sinnweja.r-universe.dev/vcpen/NEWS.txthttps://sinnweja.r-universe.dev/vcpen/citationhttps://sinnweja.r-universe.dev/vcpen/citation.txthttps://sinnweja.r-universe.dev/vcpen/citation.cffhttps://sinnweja.r-universe.dev/vcpen/doc/vcpen.Rmdhttps://sinnweja.r-universe.dev/articles/vcpen/vcpen.html