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* pubmed - Sample pubmed query (in Java): [https://wiki.duraspace.org/display/DSPACE/PubMedPrefill-PubmedPrefillStep.java DSpace PubMedPrefill] (From [https://wiki.duraspace.org/display/DSPACE/PopulateMetadataFromPubMed Populate Metadata from PubMed])
* crossref
** simply send the DOI to crossref, and get JSON back
** example: http://api.labs.crossref.org/10.1111/j.1558-5646.2009.00626.x.json
* google scholar - does it have an API?