https://xijianzheng.r-universe.dev/coefahttps://xijianzheng.r-universe.dev/api/packages/coefahttps://xijianzheng.r-universe.dev/coefa/coefa.pdfhttps://xijianzheng.r-universe.dev/coefa/doc/manual.htmlhttps://xijianzheng.r-universe.dev/coefa/NEWShttps://xijianzheng.r-universe.dev/coefa/NEWS.txthttps://xijianzheng.r-universe.dev/coefa/citationhttps://xijianzheng.r-universe.dev/coefa/citation.txthttps://xijianzheng.r-universe.dev/coefa/citation.cffhttps://xijianzheng.r-universe.dev/coefa/doc/Introduction.Rmdhttps://xijianzheng.r-universe.dev/articles/coefa/Introduction.html