Hubmed supports unAPI rev3
Alf Eaton’s excellent HubMed now supports unAPI revision 3.
Try it for yourself: look for the unAPI LINK after an arbitrary search, and the ABBR elements on each hit with class=’unapi-id’, and compose these into a unAPI formats list for some hit.
Particularly cool in this implementation is the addition of alternate biblographic citation formats such as RDF, BibTeX, RIS, and MODS to those already available from Pubmed.