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The following resolution services are included in the DOI System in addition to the main DOI resolution service:

•shortDOI
The shortDOI Service creates shortened DOI names, as aliases for existing DOI names, which are often very long strings. Applications which resolve DOI names will treat a short DOI identically to the original.
See ShortDOI Service.

•Which RA?
This service returns the name of the DOI Registration Agency (RA) responsible for a specific DOI name, or group of DOI names.
See Which RA? Service.