Crossref's been around for 15 years (and DOIs longer than that). The Crosstech blog has a lot of posts on the subject. You can start here http://crosstech.cross

Crossref's been around for 15 years (and DOIs longer than that). The Crosstech blog has a lot of posts on the subject. You can start here http://crosstech.crossref.org/category/identifiers http://crosstech.crossref.org/category/identifiers Here's a short list of posts that will give some background: http://crosstech.crossref.org/2015/06/rehashing-pids-without-stabbing-myself-in-the-eyeball.html http://crosstech.crossref.org/2015/06/rehashing-pids-without... http://crosstech.crossref.org/2015/03/january-2015-doi-outage-followup-report.html http://crosstech.crossref.org/2015/03/january-2015-doi-outag... http://crosstech.crossref.org/2013/09/dois-unambiguously-and-persistently-identify-published-trustworthy-citable-online-scholarly-literature-right.html http://crosstech.crossref.org/2013/09/dois-unambiguously-and... http://crosstech.crossref.org/2010/03/dois_and_linked_data_some_conc.html http://crosstech.crossref.org/2010/03/dois_and_linked_data_s...