rip.com
rip.com/index.php?p=1&k=2
http://searchengineland.com/rip-google-pagerank-retrospective-244286
http://3tags.org/article/rip-google-pagerank-score
http://www.webkites.in/blog/rip-google-pagerank/
https://araghu.wordpress.com/tag/rip-google-pagerank/
https://news.ycombinator.com/item?id=11254218
https://juist.nl/blog/rip-google-pagerank/
https://www.jmfieldmarketing.com/seo-2/google-removes-pagerank/