The .nbib file format is a proprietary and a document file type that can be found in files used in citation manager service developed by the U.S. National Library of Medicine. The .nbib file contains citations from books and can be sent using Firefox.
Doing a research directly in PubMed (a free search engine accessing primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics), the user, after marking all the records needed, is prompted to send the marked records in Citation Manager for profiling and authorization. When done, document/s with .nbib is/ are generated and it/they will be sent through chosen browsers and the Internet will prompt the download. The .nbib files can be found in the Endnote Library.
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File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.
If you have additional information about the NBIB file format or software that uses files with the NBIB suffix, please do get in touch - we would love hearing from you.