https://reinhardfurrer.r-universe.dev/spam64https://reinhardfurrer.r-universe.dev/api/packages/spam64https://reinhardfurrer.r-universe.dev/spam64/spam64.pdfhttps://reinhardfurrer.r-universe.dev/spam64/doc/manual.htmlhttps://reinhardfurrer.r-universe.dev/spam64/citationhttps://reinhardfurrer.r-universe.dev/spam64/citation.txthttps://reinhardfurrer.r-universe.dev/spam64/citation.cff