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CrossRef is the "citation linking backbone for all scholarly information in electronic form." CrossRef provides a DOI (Digital Object Identifier) resolver service, as well as an API for this service. Queries can be made with bibliographic data to retrieve a DOI, or a DOI can be provided to retrieve associated metadata.
HTTP GET and XML are used for queries and responses are returned in pipe delimited, XSD_XML, or unixref formats.
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