See: http://ocoins.info/
- Implement first in https://github.com/mvolz/html-metadata
- Look for it in the html? I don't think we actually do this. http://www.univie.ac.at/elib/index.php?title=COinS_Microfromat_Bibliographic_Metadata_for_Embedding_in_HTML
One possible issue is that often this is used actually for references cited *in* the page, so we might get multiple citations that aren't actually of the page in question. We might not want to do this at all.