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Digital object identifier - Wikipedia
WHAT IS THE DIGITAL OBJECT IDENTIFIER (DOI)?
What is a DOI? - Digital object identifier
Digital Object Identifier - Simple English Wikipedia, the free …
Wikipedia:Digital Object Identifier - Wikipedia
What is a DOI? | Finding and Using Digital Object Identifiers
Key Facts on Digital Object Identifier System
DOI System Overview > History and Purpose of the DOI System
What is a digital object identifier, or DOI? - APA Style
DOI® Handbook - Digital object identifier
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