https://andrewzm.r-universe.dev/FRKhttps://andrewzm.r-universe.dev/api/packages/FRKhttps://andrewzm.r-universe.dev/FRK/FRK.pdfhttps://andrewzm.r-universe.dev/FRK/doc/manual.htmlhttps://andrewzm.r-universe.dev/FRK/citationhttps://andrewzm.r-universe.dev/FRK/citation.txthttps://andrewzm.r-universe.dev/FRK/citation.cffhttps://andrewzm.r-universe.dev/FRK/doc/FRK_intro.Rnwhttps://andrewzm.r-universe.dev/articles/FRK/FRK_intro.pdfhttps://andrewzm.r-universe.dev/FRK/doc/FRK_non-Gaussian.Rnwhttps://andrewzm.r-universe.dev/articles/FRK/FRK_non-Gaussian.pdf