The Digital Object Identifier (DOI) is a permanent and citable identifier for electronic documents, including electronic journal articles. It begins with a "10". There are two ways to access a document using the DOI:
Citation databases record the publications in which a publication has been cited. They can be used to go from one literature source to other sources (keyword: "forward chaining").
CiteSeerX (search engine)
citation database integrated via "cited by" function
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