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.
The following is a list of SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.