I don't think random SEO sites count as substantiation, but: http://www.lowprofilelinks.com/blog/?p=35 http://www.lowprofilelinks.com/blog/?p=35 http://www.art

I don't think random SEO sites count as substantiation, but: http://www.lowprofilelinks.com/blog/?p=35 http://www.lowprofilelinks.com/blog/?p=35 http://www.articlesbase.com/link-popularity-articles/backlink-edu-power-with-links-and-guest-posts-1321865.html http://www.articlesbase.com/link-popularity-articles/backlin... Those only talk about inbound links from edu pages increasing one's PageRank, so maybe I was remembering incorrectly.