https://cran.r-universe.dev/bvlshttps://cran.r-universe.dev/api/packages/bvlshttps://cran.r-universe.dev/bvls/bvls.pdfhttps://cran.r-universe.dev/bvls/doc/manual.htmlhttps://cran.r-universe.dev/bvls/citationhttps://cran.r-universe.dev/bvls/citation.txthttps://cran.r-universe.dev/bvls/citation.cff