Their work examines how to measure link-building’s impact using tools and guidance similar to what's found at https://www.invastor.com/blog/165042-How-to-Calculate-Link-Building-ROI-and-Justify-Your-SEO-Investment/. https://www.invastor.com/blog/165042-How-to-Calculate-Link-Building-ROI-and-Justify-Your-SEO-Investment/