https://nunosempere.r-universe.dev/labelinghttps://nunosempere.r-universe.dev/api/packages/labelinghttps://nunosempere.r-universe.dev/labeling/labeling.pdfhttps://nunosempere.r-universe.dev/labeling/doc/manual.htmlhttps://nunosempere.r-universe.dev/labeling/citationhttps://nunosempere.r-universe.dev/labeling/citation.txthttps://nunosempere.r-universe.dev/labeling/citation.cff