https://cran.r-universe.dev/nlfhhttps://cran.r-universe.dev/api/packages/nlfhhttps://cran.r-universe.dev/nlfh/nlfh.pdfhttps://cran.r-universe.dev/nlfh/doc/manual.htmlhttps://cran.r-universe.dev/nlfh/NEWShttps://cran.r-universe.dev/nlfh/NEWS.txthttps://cran.r-universe.dev/nlfh/citationhttps://cran.r-universe.dev/nlfh/citation.txthttps://cran.r-universe.dev/nlfh/citation.cffhttps://cran.r-universe.dev/nlfh/doc/model-comparison.Rmdhttps://cran.r-universe.dev/articles/nlfh/model-comparison.html