On Friday I discovered that BHL has started issuing CrossRef DOIs for articles, starting with the journal Revue Suisse de Zoologie . The metadata for these articles comes from BioStor. After a WTF and WWIC moment, I tweeted about this, and something of a Twitter storm (and email storm) ensued: To be clear, I'm very happy that BHL is finally assigning article-level DOIs, and that it is doing this via CrossRef.