https://yuzhou-isabella.r-universe.dev/quantoptrhttps://yuzhou-isabella.r-universe.dev/api/packages/quantoptrhttps://yuzhou-isabella.r-universe.dev/quantoptr/quantoptr.pdfhttps://yuzhou-isabella.r-universe.dev/quantoptr/doc/manual.htmlhttps://yuzhou-isabella.r-universe.dev/quantoptr/citationhttps://yuzhou-isabella.r-universe.dev/quantoptr/citation.txthttps://yuzhou-isabella.r-universe.dev/quantoptr/citation.cff