https://bastistician.r-universe.dev/hhh4contactshttps://bastistician.r-universe.dev/api/packages/hhh4contactshttps://bastistician.r-universe.dev/hhh4contacts/hhh4contacts.pdfhttps://bastistician.r-universe.dev/hhh4contacts/doc/manual.htmlhttps://bastistician.r-universe.dev/hhh4contacts/NEWShttps://bastistician.r-universe.dev/hhh4contacts/NEWS.txthttps://bastistician.r-universe.dev/hhh4contacts/citationhttps://bastistician.r-universe.dev/hhh4contacts/citation.txthttps://bastistician.r-universe.dev/hhh4contacts/citation.cff