https://dirkschumacher.r-universe.dev/ompr.roihttps://dirkschumacher.r-universe.dev/api/packages/ompr.roihttps://dirkschumacher.r-universe.dev/ompr.roi/ompr.roi.pdfhttps://dirkschumacher.r-universe.dev/ompr.roi/doc/manual.htmlhttps://dirkschumacher.r-universe.dev/ompr.roi/NEWShttps://dirkschumacher.r-universe.dev/ompr.roi/NEWS.txthttps://dirkschumacher.r-universe.dev/ompr.roi/citationhttps://dirkschumacher.r-universe.dev/ompr.roi/citation.txthttps://dirkschumacher.r-universe.dev/ompr.roi/citation.cff