https://ivaughan.r-universe.dev/econullnetrhttps://ivaughan.r-universe.dev/api/packages/econullnetrhttps://ivaughan.r-universe.dev/econullnetr/econullnetr.pdfhttps://ivaughan.r-universe.dev/econullnetr/doc/manual.htmlhttps://ivaughan.r-universe.dev/econullnetr/NEWShttps://ivaughan.r-universe.dev/econullnetr/NEWS.txthttps://ivaughan.r-universe.dev/econullnetr/citationhttps://ivaughan.r-universe.dev/econullnetr/citation.txthttps://ivaughan.r-universe.dev/econullnetr/citation.cffhttps://ivaughan.r-universe.dev/econullnetr/doc/econullnetr-intro.Rmdhttps://ivaughan.r-universe.dev/articles/econullnetr/econullnetr-intro.html