https://keeeeei0315.r-universe.dev/GARCHSKhttps://keeeeei0315.r-universe.dev/api/packages/GARCHSKhttps://keeeeei0315.r-universe.dev/GARCHSK/GARCHSK.pdfhttps://keeeeei0315.r-universe.dev/GARCHSK/doc/manual.htmlhttps://keeeeei0315.r-universe.dev/GARCHSK/citationhttps://keeeeei0315.r-universe.dev/GARCHSK/citation.txthttps://keeeeei0315.r-universe.dev/GARCHSK/citation.cff