General-purpose reference collections that provide BibTeX citations
Google Scholar also allows you to download a BibTeX citation for each of its search results. You have to enable the feature from the Preferences page, though.
CiteULike - site with loads of references and it is a bit of “social” referencing. You can create, import, export collections as bibtex and manage all of them online.
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Web Reference Database
refbase - web-based, platform-independent, multi-user interface for managing scientific literature & citations.
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Subject-specific collections that provide BibTeX citations
Reference managers that allow BibTeX export/import
for
PHP bibliophile has a library for converting to and from BibTeX. This is used by programs such as refbase for exporting references in BibTeX format.
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Qiqqa - has a 'BibTeX Sniffer' wizard and auto-association of BibTeX with PDFs
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Transformers
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doi2bib.org generates BibTeX citations from digital object identifiers (DOI), available for most (recent) publications.
ris2bib The simple EndNote to BibTeX (bib) bibliography format converter.
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JabRef;
DL - written in java - to run it you have to install also java run-time environment. You can use it to convert among formats - for example from BiBTeX to RIS
File/Open library [test.bib]
File/Import export/Export [test / select RIS format]
To get bibliographic data about papers you can try with Google scholar
At the beginning of the last line of paper description click on the double quote sign. You will get the corresponding citation in different styles and at the bottom options to export citation in different formats:
BibTeX:
RefMan / RIS:
To transform from RIS format to WoS format you can use in R the function ris2wos
described in BibTeX2Pajek.
Search for the author on Google books. If found select the book.
For example, among the books select the book “Generalized Blockmodeling”. Then click on the About this book on the left margin. At the end of the new page you will find Export citation options.